While I basically agree with @ChubbyRain's assertion of polarity, I find it absurd that people complain about the fairest deck in the format. If you're not playing against Gush decks, you are probably playing against:
- a graveyard deck that kills you on turn 2.5 without casting any spells
- a deck with four lands better than Black Lotus that prevents you from casting any of the cards in your deck
- decks that aspire to kill you on the first turn with the Storm mechanic
While it's certainly true that Gush sits on a bunch of worse decks such that most matchups are against things much worse to play against than Gush, the idea that those things go away if you get rid of Gush is lunacy. Workshops, Dredge, and Combo will not magically get worse if you weaken the Gush deck. The idea that there are a bunch of blue decks sitting out there that can compete with strategies as divergent and fundamentally broken as those but somehow can't beat Monastery Mentor is pretty silly. Furthermore, if that good-against-everything-but-Gush deck does exist, getting rid of the Gush deck will just lead to another, more oppressive blue overlord.
In other words, either whatever replaces Gush is better against non-blue archetypes and thereby produces a more oppressively blue format than we have currently or whatever replaces Gush is worse against non-blue archetypes and Vintage will feature more non-games delivered by Workshop, Dredge, and Mox Opal. If Wizards took the common sense approach and restricted Mishra's Workshop and Bazaar of Baghdad, the format would have far fewer non-games, and you would actually have space in your deck to combat a 3-mana 2/2 and a turn three Divination.