Dear Peter,
I don't know if a Patriarchate can be excommunicated or not - but those in the ROC who were personally involved in the 1946 sobor are long gone.
Ultimately, the question isn't whether the ROC had its hands tied and "had" to go along with the soviet power at the time.
It is really a question of why the ROC today appears to be justifying what happened in 1946, rather than condemning the events and feeling repentant over its inability to oppose the spirit of the world etc.
What intrigues me is that a Church like the RC Church, infallibility et al. can actually have a Pope who apologises and repents of past wrongs perpetrated by his own Churchmen, but an Orthodox Church, that prides itself on rejecting papal infallibility, appears unable to admit committing a sin in the past with respect to the UGCC.
Moreover, it continues to defend its actions and I've comments from individuals here defending the MP's actions.
Someone once wrote about the "ingratitude" of the Ukies toward the ROC who "nurtured" them when they didn't have their own church etc.
That statement stuck in my craw like an underdone piece of meat!
But I guess a lot of things will be swept under the carpet for the sake of ecumenism.
But let's see some tangible results from all the sweeping people!
Prostrating before you deeply,
Alex