The optimum outcome: We become like the Orthodox
The likely outcome: We become like the Anglican Communion.
I'm not sure how "optimum" the Orthodox solution is, with all due respect. For one thing, it has frequently left Orthodox churches very vulnerable to government interference, and even to a cosy system where the secular head has acknowledged power over episcopal appointments and clergy in the church.
It also tends to carry this all the way down to the parish level. When I lived near Cleveland, one of the regular features was the break-up of Orthodox churches, either because they had gotten mad at some primate somewhere (not necessarily even in this country) or simply because they were arguing over the property, which was generally owned by the parish and not the diocese. They even had a shooting over this, and a friend who was the daughter of an Orthodox priest told me that her father at one point kept a gun behind the altar because members of a warring Orthodox church had threatened him.
So all is not rosy with a more fragmented system. And I'm certainly not enthusiastic about the idea of having "national patriarchs," which could, as you say, be the USCCB writ large. Or it could also be like some of the unfortunate Orthodox churches that ended up confusing nationalism with Christianity.
These are all structural matters and have nothing to do with faith or doctrine, btw, but they are things that have to be worked out carefully.
I could see some sort of system based on rites, but not on nationality. However, even then, I think we have to be careful about not losing the aspect of universality, which is something that is very important in the Church.