“I note that you omitted the word “doctrine” from your list.”
I presented a list of only three things.
“That would require a HUGE change. The only way communion will be restored between Rome and Orthodoxy is if one or the other agrees to cease to exist. Either Rome would have to become Orthodox or we would have to become Catholics.”
No. If that were the case, then the Russian Orthodox Church in Communion with Rome would not exist (small as it is) but it does. It could easily be argued that it will take more “change” to get Chalcedonian Orthodox and non-Chalcedonian Orthodox into full communion then it will to get Orthodox and Catholic into full communion.
There is no such thing as The Russian Orthodox Church in Communion With Rome. There is a Russian Catholic Church that is microscopic in its numbers and has no bishops of its own. Is that what you were referring to?
There is no Orthodox Church in communion with Rome. Those ecclesial entities in communion with the Roman See are Catholics. They subscribe to each and every dogma proclaimed by the papacy and its councils.
We don’t even recite the same Creed. Communion will be restored when one or the other ceases to exist.