I know... oh, I know... that iCloud stuff is goofing up a beautiful future. Ah well. I think some accessory manufacturer could make a dock + storage solution that kind of does what is missing from the iPad; this way also sells more Macs to allow storage.
It'll be a few years before Apple realized iCloud was merely a transitory item blocking the light. SS memory will dive in price this decade, and the storage on the iPad or off will blow away the iCloud.
The concept of "cloud storage" will not likely go away. But it may evolve into something different than companies are currently developing.
Where things are going is really towards a world where you have your data and it is stored somewhere, accessible everywhere. The debate in the tech sector seems to be over where that "somewhere" is. Some think it is in centralized services like iCloud/Dropbox. Some think it is your smartphone. Some think it will be in more advanced NAS systems.
Sounds like you fall into the third group. Personally? I think it will be all 3 to one degree or another. There are some real technical/social issues with personal clouds (either the NAS or smartphone variety) that aren't exactly easy to solve. Where at least some of them are considered solved when talking about centralized services.