It's one thing to say (and I do say) that the Melkite Catholic Church, for example, doesn't have any western-rite parishes and isn't going to create any; but to say that, if Catholics and Orthodox came into full communion, then the already-existing WRO parishes in the Antiochian Orthodox Church would go into the Latin Church? I'm just not seeing it.
easier for me to accept than the idea that, when Catholics and Orthodox reunite, WRO will join the Latin Church. The latter idea was baffling to me when I first heard, and I fear I still haven't been able to wrap my head around it.
Perhaps because the Eastern Catholics have their own sui iuris churches, whereas the WRO don't? Interesting to note that while "Eastern Rite Catholic" is generally a misnomer, "Western Rite Orthodox" isn't as much.
I'm not sure I see the argument you're making.
Fr. Joseph Gingrich (of St. Mary of Egypt WR ROCOR Church in Indiana) has said that his impression of what the future would hold, would be that the Western rite vicariate would quite likely become a part of one of the Anglican use ordinariates of the Roman Catholic Church if there were to be a formal intercommunion again. Whatever happened, it would almost certainly retain a similar status to what already has and not be folded into any regular latin rite diocese.
However, that being said, my own view is that by the time there were a formal intercommunion again (assuming this isn't a complete fantasy!!!) we would imagine that the average Latin rite diocese would have to be far more traditional and far more harmonious with that of the Orthodox (or Eastern Catholic) byzantine rite dioceses. So than again, theoretically, it shouldn't necessarily be a problem being part of a regular latin rite diocese. Pope Benedict was forced to create the Anglican use ordinariates as a separate diocesan entity because the majority of the Latin rite dioceses bishops were hostile to even allowing the anglican use parishes to exist within the regular latin rite dioceses. Such hostility toward Tradition amongst the mainstream of the RC is the ultimate problem that must be overcome.
There was a Melkite greek catholic priest who will remain anonymous who privately favoured the theoretical concept of a Western rite existing within the Melkite church. (A number of Melkite clergy have traditional latin rite RC background.)
The two main problems with it were:
#1 - that the Melkites have their hands full simply preserving the Byzantine rite (they only have forty churches in the USA) and quite likely would run into accusations of latinization or confusion through adopting or allowing this.
#2 - the Latin Church would most likely protest such a move and it may test the limits Melkites being able to maintain their intercommunion with Rome.