How would having a Macedonian Orthodox Church be any more ethnic than the Serbian Church, Romanian, Bulgarian and other such churches?
The natural course of things in Orthodoxy is to have various churches throughout the world. Even if, as Americans, we go under Antioch, Istanbul or Moscow, eventually we will become autocephalous. Same goes for South America, Australia and Asian Orthodox groups.
To be quite honest, I think the whole debate over Macedonia and Ukraine is just stupid church politics. There are no good theological reasons to require them to submit themselves to a foreign church. Politics are never a reason to sustain schism. Politics may contribute to a schism, like in 1204, but they should never be what sustains a schism when theological and doctrinal unity exists.
Let's also be honest here, the claim that accepting the Macedonian Orthodox Church would NOT de-legitimize Archbishop Jovan of Ohrid. Hypothetically, if EO & OO were to reunite, do you think it'd de-legitimize our Bishop in Alexandria once we'd recognize the Coptic Pope? No it wouldn't.
The idea of continuing a schism due to church politics is sick and disgusting. Who cares if they call themselves the Macedonian Orthodox Church? Who cares if the Archbishop is called Archbishop of Ohrid and Macedonia. The idea of continuing a schism because of the name of a country IS ethnophyletism and it IS putting your nationalism before your Orthodox faith.
Let Ukraine have it's own church and let Macedonia have its own church, it is not a big deal. Putting your ethnic and national identity before your faith goes both ways, not just one.
If, in the very distant future, the Church in America grows, and if the U.S. falls as a nation, and one or more of the states want to form their own autocephalous group, I don't see what the big deal would be.