Once Disney gets past the Sequel Trilogy, puts out a handful of spin-offs, and drifts away from Lucas as a 'creative consultant,' I wouldn't be surprised if they consider remakes of the prequels (although that could lead to, frightening as it is, remakes of the OT as well). Unless remakes were somehow prohibited by the contract they signed.
I bet within 10-15 years we will start hearing rumors of PT and/or OT remakes.