With T.I.M.E Stories and Pandemic Legacy I would love to see a Mansions of Madness Legacy.
Oh yeah, instead of a game replayable 6 times you'd get one replayable 12 times. Huge improvement!
The part where you smash deceased character minis with a hammer would be kind of neat.
As I keeper I never used half the minis in the base set, especially the big ones - so yeah, boil them in water till they dissolve. They're just taking up space and I hate to know the cultist better as that's all the game lets me use...
(Call of the Wild is a bit better in both regards, if you bothered to stick with the game for so long in the first place. Come to think of it - if Legacy would combine the scenarios of base game + both expansions that would be the same amount of plays for half the price (hopefully). Huge bargain. And they probably have stacks of these minis in some basement anyhow).