Anybody in the computer industry should have seen this coming. And guess what? It doesn't stop there. Every piece of media which requires external validation will come to this inevitable conclusion -- O/S product activation (XP, Vista, Server 2003, etc), other product activation (Radmin3, Norton/Symantec antivirus, etc), and any other product which requires an external server to give the user permission to install or use what they have already legally purchased.
All servers currently in operation will be shut down at some point in time. It's not a matter of if, it's a matter of when. It may be tomorrow, it may be twenty years from now. The problem is that everything you have purchased which relies on those servers to give you permission immediately becomes useless. <sarcasm> Not that it would ever happen </sarcasm>, but this sure would be a great way for a company to force you to upgrade, wouldn't it? "Due to the extremely low utilization of those servers, it was not in the company's best interest to keep them operational" or some such BS to keep the regulators/watchers happy. And that, perhaps, is the best reason to avoid (if possible) anything which requires activation or relies on external servers in order to install or continue operation.