Really interesting discussion, with some pretty good points made on both sides.
One line of thought in regards to breaking up the somewhat monotonous state of the format in regards to Gush Mentor that I don't see discussed much however, is the question of Unbannings. Perhaps there is some consideration to be given to trimming down the Restricted List by a bit. While there are obviously cards which should remain there in perpetuity (Draw 7s, Power 9, Black Tutors, etc..) there look to be some cards that I can fathom being 4-ofs in the current climate that would not result in the format buckling under the shock.
Would 4x Library of Alexandria be too much? What about 4x Balance... or perhaps even Channel - given that there are arguably even better ways of generating nigh infinite colorless mana at this point in time. These are cards that don't instinctively slide into either Paradoxical, DPS, Gush Mentor, or Shops. Well, I suppose Mentor does run it's 1-of Library from time to time but I can't see it being able to support a 4-of Library manabase, and the Wastelands, and the Gush.