Unless Albania invades Greece or Kazakhstan invades Russia, we are not looking at a big wave of immigrants to replenish many of the larger ethnic enclaves. There will be nothing other than the continued pattern of assimilation.
Fr Jiryus,
While I agree with most of your reasoning, and I wholeheartedly agree about the wisdom of taking things slow, I think this particular statement is far from Antioch's thinking. Europe, South America, and North America should all be preparing for a significant Syrian influx. If this does not happen, praise God, but we can't base our planning on the expectation of miracles. Part of the larger reasoning behind a lot of the statements of the Patriarch and the Synod is that Antioch, as much as this is due to lamentable causes, is a very international church. On paper, there are probably as many Antiochian faithful in Chile, Argentina, and Brazil as in Lebanon (the total number of Christians of Greater Syrian decent in South America would equal at least half of the modern population of Greater Syria). It's notable that one of the first things that changed when the John X became patriarch was to start issuing all synodal decisions in English, Spanish, German, and French (and often Russian, Romanian, and Portuguese).
So, one of the ways to read the decision regarding Europe is that Britain (which is almost entirely convert outside London), France (which is largely well-off and Lebanese), and Germany (where the largest parishes are made up of people from Hatay) have different pastoral needs, necessitating different metropolitans rather than different bishops within a single archdiocese, in preparation for expected rapid growth.
In any case, the struggle to liberate the Patriarchate of Jerusalem from the Greeks is part of Antioch's historical mission-- and, if we think of St Raphael's efforts in this regard, part of the historical mission of the Antiochian Archdiocese of North America, and something far more important than the limited value of the Assembly of Bishops.