Well, if the new film does as well as expected (and largely the word of mouth has been phenomenal), Disney will certainly be "influencing" it a lot more as they now own the property.
That said, I think you will be disappointed in the future of the parks, though. As Avatar shows, the direction they are heading in is more and more use of this type of thing, outside themes. Although I agree that it's a shame we haven't seen a Sleeping Beauty dark ride, for example, and I too would like to see more use of classics (especially as opposed to Pixar, I mean - we have two rides with Toy Story characters you shoot at), but Disney is out to not be Potter'd again.
It's all about your personal taste, though. Avatar is quite literally the last...I don't know what to call it, as it's not a "franchise" yet, just one film, but the last property, I guess, I'd ever want to see at WDW, but if they said they were building a park of all Star Wars and Muppets? I'd be camping out at the gate the day they announced it.
But, as I said, you should expect a lot more of this - or you will be disappointed. It's just the direction the company is going in. Like I also said, I do want more use of classic characters/films, but on the other hand - Six Flags isn't gonna build a good Star Wars or Muppet ride, so I'm glad that we have Disney to do so, or we wouldn't see them at all.