A few comments which add to Agabus and Iconodule's position...
Firstly I think some of the posters here have forgotten two major points of fact.
Historically, Christianity has always had multiple liturgies. From East to West throughout history there has been hundreds. This has diminished significantly in the last 1000 years, but so has Orthodoxy (to Roman Catholicism as it came to be known and the separation became a great divide) which has found tribalism and ethnocentrism to become the normal way to protect culture and the faith. The backlash of this being that the idea of allowing certain other liturgical rites to flourish is seen as a threat to what is now considered Eastern culture. St John Maximovitch discovered this as he attempted to establish the Orthodox Western Rite in Europe.
Globalism is neither good nor bad. It just is. In fact, it may be an environment which encourages redevelopment of multiple liturgical rites. But lest we forget that we should not just dig up the past like some have done, as if liturgy was some historical theatrical performance.
The liturgical arts are slowly developing in this new world just as they have in Russia ( which was at one time simply accepting an immigrant religious culture along with Christianity as well) and other places as well. But Russia has had 1000 years to develop this and within the US the scene is much more complicated due to the quibbling between Moscow and the Greeks about who came first [chicken or egg?].
I am not for an Eastern rite or a Western Rite. I see no division. It is Orthodox Christianity. These are merely terms which are born as ways to differentiate the two styles, post schism. But within them, there are myriad of new seeds of expression of liturgical worship which are begging to develop further if only given the chance.
I think we need to begin looking at things from this broader perspective, remembering that the liturgy which St. John Cassian celebrated was complimentary to that which St. Cyril, St. Symeon the Stylite, St. Gregory and many, many more celebrated. It is one faith.
I do not wholeheartedly agree that Christianity is dying in the world. In my own life I see it every day more clearly that progressive, fake altruism that casts aside Christianity while it accepts false religions. But this is the faith of the first century and the last. The faith that the gates of Hades will not prevail against. We will be here when, as Johnny Cash said, "The Man comes around".
Until then, we have much work to do. Why should we see division when we see these expressions of worship? I find no convincing argument.