For my company that's just not practical. We sell to schools and many of them are still running XP.
I work at a digital agency, a lot of our larger clients still desire legacy browser support (sometimes as far as IE6). Since a lot of these clients earn some serious money, we could charge a ton and it'd still make business sense for the client to support these users. Also, some of the sectors we've worked in have had some very high IE6/7 numbers, especially in the legal sector.
To answer your question, it depends on who you ask. On here and on places like Reddit you'll find a lot of people don't offer full legacy browser support, but many of us still do because we are bound by our clients. Once Windows 8 starts to take off, probably when the first service pack comes out, I fully expect the people still using XP to begin the upgrade process.
Once Windows Vista starts to take off, probably when the first service pack comes out, I fully expect the people still using XP to begin the upgrade process.
Once Windows 7 starts to take off, probably when the first service pack comes out, I fully expect the people still using XP to begin the upgrade process.
Heard it before. I expect some people to never ever leave XP, because they'll have one little activex control that their entire multibillion dollar operation runs on, and they will continue to insists a shrinking pool of vendors support it at all costs, because any expense is worth it compared to any downtime experienced by shifting their business process to anything resembling modern technology. They will be few, but they will still exist.
It's been far too long now, and even Microsoft want it dead and buried. When April 2014 hits I expect Microsoft to halt all support, and then I'd not be shocked to see XP targeted by virus makers in order to kill it off for good. Companies won't want to pay for their applications to be ported, but if the choice is to port or have their systems wiped out then I think they'll be left with no choice.
What about the expense of the Chinese/Russian/Whatevercountry hackers totally owning them because they use IE6?