It would be really great to have MM6 rebuilt like this. Certain things made MM6 drop a little low on my list (most notably the fact that it resembles a FPS at times -- buy the bows and shoot everything in sight), but if the world could be made more "living" and "meaningful", I'd be very happy to return.
(And even more so since MM6 still has quite a few great things. Just have look at those dungeons for instance, especially Tomb of VARN and the Castles (except for Kriegspire which is quite simple). I could wander for hours in each of these. I'm still waiting to see anything like it in other games.)