By the way.  I am in favor of Restricting Dark Ritual, Mana Drain, Mishra's Workshop, and Bazaar of Baghdad.  Those cards are all nuts, and if they were gone we would have much more room to play with when designing new decks.  The problem with these cards is that they are so much more powerful than all of the other unrestricted cards in the format that not building around at least one of them automatically makes one's deck flawed.  For instance, why isn't goblins good?  Because it doesn't play one of those four cards.  Also that it doesn't play Yawgmoth's Will.  If the Vintage crux--meaning, I start my deck with 4x busted unrestricted card, didn't exist we would see more decks that would be able to compete.