The issue with this discussion was the OPs contention that all of vintage should be 100% proxy. As it stands right now the number of proxies allowed in a game of magic is 0 for sanctioned, and what ever the hell number you want to use for anything else that you decide to run.
So if we extrapolate that we understand that this conversation is actually "should WOTC allow proxies in sanctioned events" which is a silly and moot discussion because the answer is that they have already said they will not.
If the issue proxies are trying to solve is ultimately the reserve list, then up until this point they really have not done much to solve it considering we have proxy events all the time and the player base has not exploded. Proxies are not the thing holding back the format, because people still see the format as a costly and elite one even if it costs them a grand total of 75 basic lands and a sharpie.
If the conversation is about how do you grow the format, then your discussion lies somewhere in the nexus of:
- Print new cards that make reserve list cards unnecessary or options as opposed to manditories - Not possible for some cards but I think you could get away with replacements for some things
- Print strategies that do not require Moxen/Lotus - Dredge was the first and really only one we have had.
- Restrict a few pillar cards - Workshops and Bazaar come to mind, though the effects of that would have to be tested and new cards printed to fill the roles in a less powerful way.