It would be really interesting if they took a forward-looking approach. "We're not supporting IE 6, PHP 5.3 is required, all the visual niceties are based on CSS3 and HTML 5, etc." Although I still think that things using JavaScript should degrade nicely. There's no excuse to be using an older browser like IE 6. There are many valid reasons to have JavaScript disabled, however, and I think that's something that should definitely be supported.
OK, now I am really going to sleep. Thanks for wasting a few hours of my time, XenForo. I am going to be soooooo tired tomorrow.