The reason for the low numbers of pavement midgets is the same as what happened to pavement sprint cars. Very few can afford the need for 2 specialized cars for each discipline. Larger car counts at pavement shows in the past were the result of being able to run the same car and be competitive because for the most part everyone was in the same boat. But, as always someone comes along and has the deep pockets and ego to spend bazillions and wipes out the competition. If you can solve the specialization problem, fields will come back on pavement. I have no idea how to do this given human behavior.