I think diversity within pillars is the real crux of the issue for people. Shops has completely homogenized to Aggro Ravager Shops because it crushes other versions of shops, as well as shops colorless 1st cousin, Eldrazi. If you could reliably play Stax, Martello, Eldrazi and an Aggro-ish Shops deck in a 7+round event, there would be less complaints. The same goes for blue, though I do not see the same diversity issues. TO ME, outcome, oath, xerox, and BUG all win the game in different ways, even if they all generally play 4 force, 4 misstep, and some number of preordain (well maybe not outcome on preordain, but you hopefully get my point).
If the desire is to have brand new never before seen archtypes (pillars) in vintage, then that will not be accomplished via restriction, but via printing of brand new game changing mechanics, ala dredge.