I thought of that too. He would be perfect in the role. (Would be funny too as he is quite rotund. Seeing his flab sticking out from under the Darth life support suit would be a hoot.)
But modern Disney is not nearly that creative. They've been riding on Eisner's "lawyering" via continual copyright extensions for YEARS now. Most of their best recent stuff has actually been Pixar's work with Disney acting as financial backer.
Frankly, Eisner should have spun off the corporate side of Disney into a generically named holding company (Mickey Holding LLC or something like that) and allowed the creative side to remain as Disney a long time ago. It would have kept the Disney brand pure and untainted and probably have made him more money in the long run.
At any rate, I'm not really upset about this. Honestly, Disney can't do any worse than Lucas has with the Star Wars franchise, and frankly, their animated version of Star Wars has not only been more Canon faithful, but better written than the first two prequels. It was long past time for Lucas' ego to be removed from the Star Wars universe. Disney will do fine with Star Wars, although I suspect that our chance to return to the "gritty" universe version of the original trilogy is long past gone.
Also, if I remember my Canon, Don't the next 3 books (Ostensibly the most logical choices for the follow-up trilogy) follow almost immediately after ROTJ? All the OT actors are OLD now. Are they going to do a series reboot or are they going to just CG the entire thing?