This would be a good addition to Hollywood Studios, IMO. Throw in a Mickey-themed dark ride and some meet and greets, and we got us a party.
One M&G I'd love is a "heroes' hangout" spot where you can get a rotating cast of characters like the Rescue Rangers, Darkwing Duck, Launchpad McQuack, etc. You could even throw in other characters with little or no park representation like Hercules and the Rescuers. The Incredibles could occasionally be stationed there, as well (I know they already do M&G). With the popularity of superheroes right now, it seems like WDW should take advantage of their own action heroes.