If there's one thing that should replace Toon Town eventually, it's a Fantasyland expansion. There's so many more Fantasy stories that could make amazing timeless attractions, and that would be the only space they could expand into.
Another thing about Toon Town...it needs more excitement added to it besides Roger Rabbit. If they added a proper Mickey Mouse or Fab 5 attraction in there, it would be one of the hottest attractions in the park. Mickey and the gang have been popular and famous for how long now? His popularity is never gonna die, so I think removing Toon Town, as a opposed to revitalizing it, is super narrow-minded.
As for removing Small World? Yeah...um. nope.
Autopia? Sure, I've been ready to see it gone for years. Only issue is that it's on top of the sub building, which Bog Iger said is too unique to completely get rid of. So...Disney has to be very smart about what they do.
My issue with sticking Star Wars land elsewhere is because they should first fix Tomorrowland, and I don't see the George Clooney movie being a big enough hit to warrant a retheme. Although a generic but clean futuristic look will go so far.