The Orthodox split with Rome was entirely different in every way from the Protestant one so there goes your objection.
The Orthodox are in schism, not in heresy.
Heretical rupture with Rome begets more heresy and more splintering.
That's not a theory, it's a historical fact.
Glad I could help.
LOL! Now you made me laugh. :) As long as the Orthodox teach that there is no Immaculate Conception, no papal infallibility, no Purgatory, no "Original Sin" as Augustine defined it, etc. the Orthodox teach a different doctrine from the Latins. And that is, the definition, heresy. The Orthodox deny your dogmas and they are mere "schismatics?"
the Pope and the EP "committed to oblivion" in 1964. as regards excommunications of 1054, it merely returned the EP Ceruliarus and Cardinal Umbert back to the Church, making those excommunications null and void.
It doesn't change the fact that the two Churches differ on theological grounds as well as papal primacy of jurisdiction. What is different between protestants and Orthodox is that the latter is a sui juris Church and Protestant communities are Catholic fallouts. The Portetsants have only two options: remain outside the Church or return to the Latin fold. I think when it comes to reuniting with the Orthodox, the issue is moot, and the uniate approach is outright out of the question.