My prediction of about 5 years ago is looking better by the day: tablet-like objects that you hold up like a frame. On one side is a sensor array with microlenses on individual photosites, and on the other is a screen for composition. Lensing effects are applied after the fact.
In the nearer term, I expect larger square sensors, which would obviate the need for moving the camera to change orientation while also allowing marketers to boast about very high megapixel counts- more than 24 is pretty much pointless for a full frame 35mm DSLR so they need to go somewhere else.
Foveon technology eventually wins but not for a while.