I might also add (and I think I've said elsewhere) that even if other manufacturers TiVo-ize it, we're still likely better off than most of what's out there now... Anything can in theory be cracked, given enough time, and unless they do something really outrageous to it, once you have full root access, it's still Linux, and you could probably just gut all their junk. For that matter, to my understanding, MeeGo requires (or at least encourages) open source drivers, which makes things a lot easier.
But yeah, Nokia seems pretty committed to Openness themselves, which is awesome.