Just for the record, I get a lot of predictions wrong, but here's one I got right (at least long term) back before the iPad launched:
But, let's offer a wildcard alternative: fully wireless sync with your current Mac ecosystem. Perhaps this would be extended to some iPhones and iPod touches too ”” say just the 3GS. I expect Apple to play up sync in general in the future. As iTunes goes, so goes Apple's overall strategy. The introduction of “Home Sync” quietly last year is something I believe will be the harbinger of bigger plans, with Apple returning to sync in a big way this year after pretty much letting its previous strides rust and be forgotten (think of the big push on sync services in Mac OS X Tiger back in 2005 and those features integration with the service then known as .Mac and now christened MobileMe).
Clearly, iCloud is for Apple this decade what iTunes was for Apple last decade.