Why dont you actually address the arguments of St. Gregory of Nyssa. You see, unlike many lesser men in the history of the Church who chose to dogmatize and pontificate rather than theologize and teach, St. Gregory of Nyssa actually presented well argued and well supported posistions.
St. Gregory of Nyssa did not actually hold this view, as Metropolitan Hierotheos Vlachos shows in his book, Life After Death. The relevant segment can be read here
The fact that you believe in a 'consensus patrum' demonstrates that either you have not adequately studied Church history or that you know better and use such arguments to strengthen a weak point. Furthermore, if you are trying to make such a point, the fact that two of the three great Cappadocians, Gregory of Nyssa and Gregory the Theologian, as well as the Catechetical School of Alexandria, and in the west no less a significant figure than St. Ambrose of Milan all advocated the theology and that St. Basil tells us that during his time apokatastasis was a theological posistion held by the majority of the Church, pretty much dismisses your argument about there being consensus on the matter. The doctrine of apokatastasis only fell out of favour when it became necessary to use Christianity as a means to control the masses; certainly an understandable development for the time, but now that we no longer have need of the Church for that purpose, the social danger of moving away from fear towards proper Christian Soteriology is minimal.
R. Grant Jones' "Dialogues and Articles on the Afterlife
" is very relevant here.
St. Ambrose of Milan:
"Now let the Manichaean have his word. 'I hold that the devil is the creator of our flesh.' The Lord will answer him: 'What, then, doest thou in the heavenly places? Depart, go thy way to thy creator. My will is that they be with Me, whom my Father hath given Me. Thou, Manichaean, holdest thyself for a creature of the devil; hasten, then, to his abode, the place of fire and brimstone, where the fire thereof is not quenched, lest ever the punishment have an end.
'" Nicene and Post-Nicene Fathers, Second Series, Volume 10, On the Christian Faith - Book II, page 239.http://web.archive.org/web/20010619041327/www.geocities.com/r_grant_jones/Rick/damnation1.htm
St. Gregory the Theologian:
"I know the emptying, the making void, the making waste, the melting of the heart, and knocking of the knees together, such are the punishments of the ungodly. I do not dwell on the judgments to come, to which indulgence in this world delivers us, as it is better to be punished and cleansed now than to be transmitted to the torment to come, when it is the time of chastisement, not of cleansing. For as he who remembers God here is conqueror of death (as David has most excellently sung) so the departed have not in the grave confession and restoration; for God has confined life and action to this world, and to the future the scrutiny of what has been done.
Gregory Nazianzen, Oration 16, Section 7, NPNF Series 2, Vol 7
"But then what advocate shall we have? What pretext? What false excuse? What plausible artifice? What device contrary to the truth will impose upon the court, and rob it of its right judgment, which places in the balance for us all, our entire life, action, word, and thought, and weighs against the evil that which is better, until that which preponderates wins the day, and the decision is given in favour of the main tendency; after which there is no appeal, no higher court, no defence on the ground of subsequent conduct, no oil obtained from the wise virgins, or from them that sell, for the lamps going out, no repentance of the rich man wasting away in the flame, and begging for repentance for his friends, no statute of limitations; but only that final and fearful judgment-seat, more just even than fearful; or rather more fearful because it is also just; when the thrones are set and the Ancient of days takes His seat, and the books are opened, and the fiery stream comes forth, and the light before Him, and the darkness prepared; and they that have done good shall go into the resurrection of life, now hid in Christ and to be manifested hereafter with Him, and they that have done evil, into the resurrection of judgment, to which they who have not believed have been condemned already by the word which judges them. Some will be welcomed by the unspeakable light and the vision of the holy and royal Trinity, Which now shines upon them with greater brilliancy and purity and unites Itself wholly to the whole soul, in which solely and beyond all else I take it that the kingdom of heaven consists. The others among other torments, but above and before them all must endure the being outcast from God, and the shame of conscience which has no limit.
But of these anon."
Gregory Nazianzen, Oration 16, Section 9, NPNF Series 2, Vol 7
"It is a sad thing to let the Manna pass and then to long for food. It is a sad thing to take a counsel too late, and to become sensible of the loss only when it is impossible to repair it
; that is, after our departure hence, and the bitter closing of the acts of each man's life, and the punishment of sinners, and the glory of the purified. Therefore do not delay in coming to grace, but hasten, lest the robber outstrip you, lest the adulterer pass you by, lest the insatiate be satisfied before you, lest the murderer seize the blessing first, or the publican or the fornicator, or any of these violent ones who take the Kingdom of heaven by force."
Gregory Nazianzen, Oration 40, On Holy Baptism, Section 24, NPNF Series 2, Vol 7
"For I know a cleansing fire which Christ came to send upon the earth, and He Himself is anagogically called a Fire. This Fire takes away whatsoever is material and of evil habit; and this He desires to kindle with all speed, for He longs for speed in doing us good, since He gives us even coals of fire to help us. I know also a fire which is not cleansing, but avenging; either that fire of Sodom which He pours down on all sinners, mingled with brimstone and storms, or that which is prepared for the Devil and his Angels or that which proceeds from the face of the Lord, and shall burn up his enemies round about; and one even more fearful still than these, the unquenchable fire which is ranged with the worm that dieth not but is eternal for the wicked.
For all these belong to the destroying power; though some may prefer even in this place to take a more merciful view of this fire, worthily of Him That chastises."
Gregory Nazianzen, Oration 40, On Holy Baptism, Section 36, NPNF Series 2, Vol 7http://web.archive.org/web/20010619045823/www.geocities.com/r_grant_jones/Rick/supplement.htm