As always there's a certain amount of wishful thinking legalese in here. And that is not to call it idiocy.
If a student lives with their parents, installs one of the licenses on his laptop; a year after he finds a job, moves to his own flat. Of course the EULA doens't allow this, after all, they no longer reside on the same house. Again, nothing is going to happen; the police isn't going to knock on your door saying: "Look Microsoft told us you have been conecting to the Internet from a diffferent location for more than six months now, so you either: move back to your parents home; bring your parents to live with you, or we will have to confiscate your harddrive" 😀
Oh well.. all in all it'a a positive thing! After all Antivirus packages have had 3 licenses for one or two years now! And for teh first time it actually makes sense. With Vista Microsoft probably actually may not have wanted you to upgrade your old low end Pentium 4 to Vista beacause of it's slugishness. Now that a few years have passed, and probably most people will at least have a high end Pentium 4, a Pentium D or an Athlon, and Windows 7 even runs more or less well on a Netbook, it actually makes sense to upgrade.