Apple would buy Disney for the same reason Ted Turner bought MGM/UA. If you are going to be a media distribution company (which is where Apple is headed) and you want total control (which Jobs always does), then owning content is part of the strategy.
The fact that Jobs sits on the board and owns a bunch of stock is evidence of his personal interest in Disney, not evidence against it. From a branding standpoint there is no better combination than Apple and Disney - don't be like Cringly and live between the Atlantic and Pacific - think worldwide. Jobs isn't insane enough to spend billions on a US cable network just to shut it down on the off chance that everyone in North Carolina will start using MobileMe 2.0.
BTW, Owning Disney would allow Jobs to dictate terms to other content distribution channels.
Why doesn't Apple buy the companies behind the best iPad/iPhone apps to make them iOS-only?
I mean, it would make sense in a way, and in the "Console Wars" console-makers have been doing this since the Nintendo-Sega days, buying studios and making exclusive games.
Under what reasonable definition of content is this true? Angry Birds and Plants vs Zombies sure feel like content to me.