I actually just got a post card in the mail from Embry-Riddle offering free tuition, free MEI, and a sign on bonus if I flight instruct there. I'm actually considering transferring because of it. It sounds too good to be true though. There will definitely be some sort of contract involved.
I'd say that colleges need them the most. The small town airports seem to have lifetime CFI's or retirees available. With colleges, everyone's goal is to go to the airlines or military, not teach. No one is staying around after they graduate.