And that's great for the regional midget racers.
You're talking about two totally different arenas.

You never answered the question about your allusion to a decreasing number of midget races in Indiana. There have not been many dirt midget races in Indiana since NAMARS folded. Why? Because there is no Regional midget series in Indiana like there is in Illinois/Missouri. USAC is a National Series - they don't and they should not have a "regular" track (such as POWRi's Little Belleville, or, to a greater extent, Badger's Sun Prairie). If there were a NAMARS-like body still around, maybe there would be a few more short-track races in the Indiana/Ohio area, but it's not USAC's job to fill your quota of a quarter-mile dirt midget race every weekend. They have plenty of other races to run (and not just in the midget division).

From what I see, USAC has a decent (it still needs work) schedule of 33 midget races, including the three cornerstone, high-paying dirt midget races in the country. They have 21 dirt races on tracks small and large.