Why are people not opening new campgrounds/RV parks?

And on top of everything mentioned above, don't forget that RVers tend to be cheapskates, and complain about the price being too high no matter what it is. They want Disney's Fort Wilderness quality at Passport America prices.

Speaking of which, I expect to see discounts like PA going away in more and more places. Discounts are given to fill vacancies. With fewer vacancies comes less need to offer discounts. The places left that do offer discounts will be the kind of places you won't want to stay.