The mentality among some is there, that if we rescind one anathema, then maybe we have to rethink other things in our religion. Orthodoxy for these people is less a pillar of truth and more a delicate tapistry or some kind of fragile organism that cannot withstand scrutiny.
First off I think this thread is derailing into unchristian attitudes. We all after all I'm sure wish the church had not split to begin with. But to put my own personal input:
Orthodoxy has changed in surface tradition. Some of our rite changes over time, a maturing if you will. But we only accept a change if the entire church accepts it. Then it is tradition. We have not however changed theological dogma without a church council, whcih that has not happened in centuries.
The problem with lifting anathema or anything pronounced at a church council is that it puts in question the timeless authority of the councils, and therefore anything else the council decided. Since we believe council's decisions are led by the Holy Spirit, it is not a simple matter to simply declare an old council's decisions wrong.
The main issue with Rome is Papal primacy. It was the original issue, and you can take away every other difference and leave that one, and we would still find it enough to not unite. For us it is a matter of principle. We see Rome as having too much authority. For us councils lead the church, and the unity of multiple patriarchs. Rome in 1054 showed that it believed itself to be more than just "first among equals" a title we hesitantly gave them in the first place. Rome wanted dogmatic power within the church, and it was evident from the way things were becoming politically. This has not changed. Pope Francis is a living example of this, as well as Vatican II. Half the catholics I know go on endlessly about how much they hate Vatican II. Bringing new Tradition into the church radically like that would never happen in the Orthodox church because we believe our tradition comes from the slow influence of the Holy Spirit, and to go against the will of the people is wrong in our eyes, as the people are just important as the hierarchs as we are all in communion with one another.
Fundamentally for us we see Papal Primacy as the Roman Church stepping away from having Christ lead the doctrine of the church (through councils as the apostles did) and letting a man lead it instead. That has been the root of everything we are against.