Power level bans and partial restrictions go away from the general concept that the format has been running on for the last 20+ years. These aren't really practical solutions. Mass restrictions, or unrestrictions do stay in line with format in a sense.
Restricting Bazaar, Workshop, Island-Subtype likely also won't happen. These are too important to what the format is currently, and would cause too much of a shake-up.
Printing cards won't happen, at least not to the benefit of the format. Most printings make parts of the format worse. The only major printings I can recall that were good for the format were Dack Fayden, and Dredge/Oath hate. The key here is that these are high level hate pieces that curtail certain strategies. They've kind of done away with really great anti-Blue hate (mostly just like 3 mana hate bears), but we could certainly use cards that fall under that umbrella. I highly doubt printing Mini-Bazaar that taps for mana, or Ugin's Temple Artifact Variety would be good for the format, even if they were printed.
All this said, Brian brings up a discussion on things that haven't been the current trajectory. Perhaps that is a "new format", but to him this is still Vintage. To many of us, dramatic changes could be made and the format would be still be Vintage. This current iteration of Vintage is certainly not the Vintage that I grew up playing, where I played my restricted Mind over Matter. In a few years, we will have yet another iteration of Vintage as new cards get printed and more restrictions probably do occur at some point.