I was wondering how much demand is there for Thai tutors? Are there many foreigners who want to learn Thai but there aren't enough people to teach them?

"Generally" there are plenty of Thai tutors available in urban areas, but not many in rural areas (but not much demand either).

At least that's my experience.

Although in just about anywhere, people should be able to find a Thai tutor, albeit just a "normal" Thai person as opposed to someone who actually has experience in teaching Thai to foreigners.