I think I must be reading that wrong...that makes it sound like they can do remote updates whenever they want, and without even a prompt? This seems wrong for a lot of "freedom" type issues, but also for some serious practical issues...
1.) I turn on my PS3 during a lightning storm, and a PS3 update starts installing without permission. Power goes out, and now my PS3 is bricked.
2.) An update installs on it's own, destroying my data...and I didn't back up everything before the update because I was never even told that there was an update, let alone that it started.
3.) A hacker figures this all out and decides to stick it to sony, by remotely bricking every PS3 system on earth.
4.) GeoHot finally gets around to writing his firmware, and decides to distribute it by this method, so every PS3 now has hacked firmware, all without any user consent.