Excellent reflection on the problem. That the author is Antiochian comes as no surprise. They have been as an Archdiocese the most welcoming to non-Arab Orthodox and Xenoi converts.
My parish was founded by a few Greek immigrant families, mine among them, a bit more than 100 years ago. Until about 30 years ago, the parish was almost all Greek. Not now. Today we are very “pan Orthodox”. Greeks make up about 40 percent of the parish. As an indication of how things have changed and how ethnically diverse we are, we now say the Our Father in 9 languages. It takes a little longer, but it demonstrates the universality of Orthodoxy and it’s reality in America. I think it’s GREAT!
As for the “diaspora”, well, while my buddies and I all love our “old countries”, most of us speak the languages and have taught our children to know and love them, not a day goes by that we don’t thank God that we or our old people came here!
I honestly think a framework can be set up whereby we can establish an American Orthodox Church. So long as it is lead by people with a solid Orthodox phronema, which knows no ethnicity, and that doesn’t develop overnight, we should be fine.