I always thought there would be a revision of the Wii that beefed up the 512mb internal storage to something greater, but that never actually happened because there never was a Wii revision, and at this point its very unlikely there ever will be.
That said, is it reasonable or unreasonable to expect there to be a WiiU revision at some point down the road? I would expect such a revision to at least beef up the 8gb internal flash to 16 or 32gb or something down the road. Nintendo should aim for 32gb right now. That would put it higher than the 20gb PS3 or 360s were back when they launched. 8 or 16gb is just too low, and its also embarrassing because that's less than what the competition launched with 5+ years ago. 32GB would at least trump what the competition started out with last generation, and it would be a good starting point for the next gen.
But anyway back to the revisions... whatever the WiiU starts out with, I hope there will be future revisions which bump it up higher. HD games consume a lot of storage. DLC addons consume a lot of storage. If you bring music and movies into the equation then its even worse. 8GB is less than the storage of one dual layer DVD. How could anyone think that will be sufficient for this HD era? I understand Flash storage costs more per GB than an HDD, so I know its not reasonable to expect 128GB or anything like that, but is 32gb out of the question? I think that should be the minimum threshold.