I think you've articulated a great point about the current trend in the Cloud services and fast SSD personal computers. I have personally stayed away from the large storage plans at services like Dropbox because, as you point out, they would fill my entire 128GB Macbook Air instantly. But that seems to be the common theme with laptops these days – blazing fast hard drives at the cost of larger storage.
I actually think iTunes Match does a good job of solving this problem, on a media storage basis. I have my whole library "uploaded" to iTunes, but then I can selectively download and listen to songs on any device when I need them, even to my 8GB phone. Now my music library doesn't clog up my computer or phone or tablet, etc.
If dropbox found a similar model, I would sign up for that in an instant.
I actually think iTunes Match does a good job of solving this problem, on a media storage basis. I have my whole library "uploaded" to iTunes, but then I can selectively download and listen to songs on any device when I need them, even to my 8GB phone. Now my music library doesn't clog up my computer or phone or tablet, etc.
If dropbox found a similar model, I would sign up for that in an instant.