While it would be entirely impossible to enforce, I would like to see the following.
For the Foundation:
If it really is changing to Sanctuaries, here are some thoughts. The Foundation is set to be a corporate entity (non-profit mind you). So first, the Foundation if switching to Sanctuaries should be staffed by a council. That council should be voted upon by the Sanctuaries in my mind. But I would like to see for the Foundation vote ONLY , votes to require true identification of who a voter is and how many Sanctuaries they are claiming (and of course there would need to be proof of ownership). The Foundation members should be elected by their true identification as well, although if an individual chose to say "My Name is John Smith and my BBP handle is CryptoBear123" that would be good too (but not required, although I'd personally be wary of voting for a non-community member). Foundation members should be required to verify their holdings, not necessarily in a down to the penny way, but broad strokes such as own 10-20 MN and hold 5-10M BBP.
For general Governance voting:
While again, it would be based on trust, I would think no one individual should vote more than 10% of the outstanding votes, and furthermore, the should never vote more than 5% of the outstanding votes "no". This is because the must win by 10% margin of nodes, makes it far easier to spoil a vote than pass a vote. I'm lukewarm on if I'd be in favor of limiting votes for one's own proposals beyond a 5% quantity of outstanding votes, as in the future I'm of the belief the percentage of nodes that vote will actually go down, and prohibiting voting on your own entirely is a very high bar if you happened to hold a significant number of the normally voting nodes.
Additionally, on another topic, but tangentially related, I would like see further enhancements of the Sanctuary system, specifically the ability to name one wallet with the voting rights, a second wallet with the staking rights and a third wallet with the reward rights. For most this would all be the same wallet. DASH is working on this now.
I would really like to see if it was feasible to do two more grand ideas which would help the coin I believe. The first is coin leasing, where you could lease your coins to another wallet for a predefined time for a predefined cost. The second grander idea works best with the preceding. That is to allow multiple payees from a single block reward (either Sanctuary Reward or PoDC payouts). If we could do both of the preceding, you basically would have a no risk - low work, shared Sanctuary, or shared Staking. I'm not aware of any coins that have that feature, and it would build on the features we have now and improve them. I think that sort of development could pay bigger dividends (that is extending the functionality of a current feature) than trying to work on entirely new features.