Lots of last-minuters out there.
My experience may not be universal, but in the last two weeks I have had a rash of customers calling me about the need to replace their XP systems. They've known about it for months, they've been told the system needs replacing, but until an alert appeared on their machine telling them that Microsoft Security Essentials would stop working, they've done nothing about it. I now have a couple of months of completely full order books while I replace these computers for Windows 7 or 8 (mostly 7) systems.
I would guess that there'll be a reasonably big drop in the number of XP users over the next 8 weeks, then you'll be left with the die-hards and the people who can't afford/don't understand.