Apple trying to get multiple downloads

Not being able to download a file more than once isn't too big a deal if you're responsible about backups, at least if we're talking unDRMed media (putting a download-once limit on DRMed stuff is just obnoxious), but this would still be nice for iTunes users. The reason, though, that Apple is doing this is that it is really necessary for their vision of a post-PC future. Presently the need to backup makes the use of the PC a practical necessity. If they could institute some combination of cloud-based backups and multiple downloads, the PC could eventually be totally eliminated. I'm not saying I welcome this--actually, the prospect of a post-PC world run by Apple of all people terrifies me considering how restrictive they are--but it does make sense.