While it is an interesting thought that OCA/ROCOR/MP could unite, I don't think the MP will allow a self-rule status of any of its churches in the western world with Russian populations.
Yet - ROCOR does and will continue to have self-rule status. That was never questioned in the negotiations, and is a fact of the agreement. ROCOR already has self-rule status in union with Moscow (formalised on May 17th, 2007). The OCA also does in fact still have a sizeable Russian contingent - not only of Russian Americans particularly in the West, but also most of the recent immigrants from the CIS. Interesting fact about the Carpatho-Rusyns: Jordanville was moved to America from its foundations in what was formerly Czechoslovakia - the St Job of Pochaev Brotherhood in Ladomirovo, Czechoslovakia. Much of ROCOR originally was from Carpatho-Rusyn origins. Met. LAURUS was born in Ladomirovo, Czechoslovakia. The Carpatho-Rusyn Greek Catholic part of the OCA is mostly in the Midwest/Mid-Atlantic States. That the OCA is multi-cultural is true, but so is the MP, ROCOR, Antioch - even the Greeks. The 'Americanness' of OCA is not unique, nor even all that American (I'm old American since Jamestown - and don't recognize much 'Americaness' in the OCA. It looks Russian to me - even when I was around Fr. John Reeves or Fr. John Maxwell, it still looked and felt Russian. So - I wouldn't sell any of them short, nor give in to negative stereotypes of what folk think OCA, ROCOR, or anyone else is supposed to be.
RE: Multiculturalism in the Greek church - ever met any Aromanians? Many in America - speak a Latin language, purer Latin than Romanian without all the loan words from Slavic. They have unique musical, dance, dress and food traditions. Also the Pontic Greeks are different culture than Morean Greeks, or Cypriots, etc. And there are even Hellenic Orthodox Gypsies, Hellenic Orthodox *Turks*, and other cultures in the Greek Orthodox Church. The Antiochians have Arabs, Greeks, Arameans and others in the Old World. Many forget this - and particulary that the Russian tradition is multi-cultural in the extreme: embracing folk from East Asians, Central Asians, Siberians, Turkic peoples, Caucasian folks, East Slavs, Karelians/Finns, Altaic people, Tatars, and many more ethnicities.