Hello to everybody from Spain and sorry for my english.
To me the discussion of banning yawgmoth´s will, is a sintoma of another problem that the Vintage community will have to face someday. This problem is that the card poll is growing with each collection that enter (Grim Tutor, Imperial Seal, Gifts Ungiven, Trinisphere...), and the decks are becoming more and more powerfull ( Which I love

).
I think it may happen that one day the restricted list won´t be enough to keep the power of some decks in check. Then Vintage would be a monster that can eat itself. If that happen we would be forced to change things.
I think banning cards is not the solution the format needs. To ban Yawgmoth´s Will will leave the things almost in the same situation that we have now ( almost every deck playing more than 6 mana artifacts, a lot of tutors, and 2 or 3 bombs that leave the game sealed by turn 3).
If you really want to shake the format why not to intruduce a limit in the restricted cards per deck you can play. Now the tier 1 decks runs about 15-20 restricted cards, which are pretty much the same in every deck. This is what limits the tactics or the strategy in Vintage: In order to win you have to play with this cards.
If you could play with only 9 restricted cards which will they be? The tutors? The aceleration? The Bombs? Ancestral and Time Walk?