Sigh, this errenous reasoning has been refuted over and over again.
You can't patent a simple concept or idea of a technology, certainly not a hypothetical technology, what you see in sci-fi movies is just that, ideas. If someone actually invents the technology that allows for those things to happen, that invention can certainly be patented.
This case doesn't deal with the working technology of the iPad, of which 2001 describes nothing about. It's about the design concept, which was clearly established prior to the iPad if you look at 2001 and other, even real world, sources. That is prior art.
Apple has simply used existing (prior art) design concepts, claimed it to be their own and are sueing others that does the same thing.