if we keep building sites that look good in IE6, people will keep using it. If we stop, they won't.
If this were true, fewer IE6 users would exist. There is no "if you break it, they will upgrade". That is, nobody upgrades because web pages "look funny". They upgrade because they have money/opportunity/permission and want m0aR (of whatever: speed, memory, security...).
My bank spent over 10k+ guilders (yeah this is pre-euro) for some huge ginormous Java system that works with IE6. Bank workers also connect to the Internet while working with this program, so IE6 is used for both intranet and internet.
it is mostly only used by large companies anymore
Uh, and much of my entire extended family. And all the farmers around here. And the small community stuff like the local fire dept (well, they were using IE5 with Windows2000 servers actually). And we still get calls from customers about some stuff we've put on our web pages for IE6 users only (hee hee).
That and I think it speaks pretty poorly of anyone's skills as a "web developer" if they can't make something readable or usable in IE6. Seriously, it's not that hard (a pain in the butt sometimes, but not hard). We're not talking about web applications here, just a plain-content web page.
And since IE9 isn't even out yet (tho it will come out officially during this competition!), IE8 cannot be counted as "legacy". Esp not with XP as one of the most popular paid Operating Systems in the world (IE9 won't run on XP).
But, Opera being left out surprised me. Especially since I've seen it act weird with funky fonts.