Charlie Spencer
Road courses and short tracks.
There are fewer cars because there are fewer sponsors wiling to pay what it costs to fund a Cup team. There are fewer sponsors because many of them no longer consider NASCAR an effective way to reach impressionable demographics.Nascar's elixir is young people and until they can figure out a way to entice young people to become fans they are spitting into the wind. When less than 10% of your audience is 18-34 and 65-70% is over 50 it doesn't take Pythagoras to understand that the current Nascar fan is aging out and dying off and are only being replaced by a fraction of young people.
Smaller fields aren't a problem; they're a symptom.