My two previous posts were tongue-in-cheek, of course. But forcing updates on reluctant users can have catastrophic consequences. Especially when the updates themselves are buggy, as the recent one from Microsoft (for Exchange Server, I think).
Sure, we can say that users who want control over their updates should disable the automatic update feature, but that's probably a small comfort to someone who didn't do that, and is now unable to send or receive emails for his or her business.
As long as we who create websites and web applications continue to jump through all sorts of hoops to make them work in irreparably broken dinosaurs like IE6, there will be people running IE6. But who dares to be the one to break that trend?