Businesses still sticking with XP?

XP is officially dead now, but I've noticed numerous large businesses still haven't switched.

- My entire school district, which serves about 50,000 kids has at least 20,000 Windows XP workstations.

- My local DMV still uses Windows XP Pro on all of their computers.

- Most of Utah's government computers run XP.

Is it possible to just stay on XP?