Automatic updates weren't enabled on XP until one of the service packs. So millions of PCs will never know about the new browsers.
They will when they can no longer view many of their favorite websites. I'm glad YouTube and other sites are doing this. We need strong leadership to force IE6 off the web.
Pretty soon, the idea of banning IE6 from websites will hit critical mass and suddenly it'll start affecting websites used by people in businesses who refuse to upgrade out of IE6. That's when those IT departments will finally upgrade to something newer than an 8 year-old browser. In Internet years, that's like 100.
Computer programs expand so as to fill the core available.