just a comment to this interesting topic:

as we know, members of these founds need to trust one person who manage the forging-account.
charming would be to have "forging-hub's" where stake holders can connect their accounts.
the earned fees would distributed proportional to the account balance.
the hub manager keep a fee - for sure ;-)

I could imagine that concept would join more people as the single account-concept.
an nice side effect would be that the periodic distribution of all fees would generate new fees...
this sustains the whole system.