I joke about Apple going bust – even if they stay solvent, what’s to stop them wiping all your music and movie purchases?

The fact that:

a) music in iTunes has been DRM-free for years. Back it up (Apple even suggests so) and play it anywhere you want.

b) who in their right mind purchases movies? How many times you want to see the average movie? You can rent them of iTunes or anywhere else, see them, and you’re not tied to anything.