First, I've been a huge ProStock fan since it's inception. The technology, complexity, difficulty to drive, & close competition is second to none, but if you step back and look at it from a business & average fan perspective, what's more exciting to watch, ProMod or PS? In the beginning, PS cars compared to other doorslammer cars were "out there". Now they all appear very similar to other classes, bodies are governed by templates, etc. From a purely sensory perspective, ProMods provide both a broad visual as well as sound experience because of the various power adders that is "more like" it's big brother fuel cars if you look at it from the 5,000' view. We all know but don't like to admit it, that a majority of the fans come for the nitro cars because of the the look, the speed & sound experience they provide.
Unfortunately, the costs involved in ProStock have reached a level that very very few can participate in or sustain over the long haul. Shocks that are $18K a pair for example, constant engine development programs, new materials development, has brought it to a level where car counts can't even make a full field any more at many events. If you just look at the number of actual teams and if they only had one car each it doesn't take a rocket scientist to know how many cars there would be, VERY few. Again, from a fan point of view most have no clue as to all the technology, difficulty, costs, etc. it takes in the class. All they see is PS cars that look the same, sound the same, & go down the track the same every time at a spectator sensory level well below other classes. For racing to survive, racing has to attract the spectator fan base as well as the racer base. If I was the NHRA I'd be polling at every event & through social media as to what fans would prefer, either PS or PM, or both for that matter, but make PM a professional class as the others are.