I don't think Eastern Europe has what it takes to push metal forward in any revolutionary way. EE bm is hot right now because it's relatively fresh and has a somewhat different approach, but that'll get old. Besides, when most of it is murky folk/black metal with even murkier lyrical themes it doesn't look very promising to metal as a whole.
Hey, I think metal could still evolve a lot in the lyrical department, hopefully there'll come bands with something real to say, i.e not senseless Christ-bashing, dungeons and dragons, or cheesy nostalgic NS themes. I'm talking bands like Sabbath, that more often had something real to say.