I thought that initially, but then noticed that iDisk is just a part of MobileMe, and sounds like iCloud isn't going to do everything iDisk did/does. I like the idea of iCloud, but if it is 1/4 the storage capacity of iDisk, and is in-app only, as it appears to be, would be a step backward functionality-wise from iDisk. MobileMe has had it's issues obviously, but iDisk has been around 10 years now, and some of us rely upon it pretty heavily, especially in the non-IOS hardware area.
With Dropbox and Google's storage solution (don't use, can't recall name) coming along, I'd be surprised to see them drop this kind of functionality. Prepared to be bummed though if that's what's happening though.