Some geological experts believe the sinkhole activity is increasing because developers are pumping more water out of the ground for new projects or for agricultural use. While acid in the water itself is what causes the limestone under much of Florida to dissipate and create the holes, the water also acts as a support. Add water from heavy rains on the top soil, and you've got a bigger problem.
I wonder if any geological experts have considered the possibility that a different sort of pumping might be responsible, namely, the pumping of oil out of the ground. That possibility, however, might be too controversial for them to take on.