It sounds like a great opportunity for the parks to make some improvements and for you to put your tax dollars to some good use. As camping provides more money to the parks, the parks will have to cater to campers. The more campsites - the better the profit. Look for hook-ups, fee increases on weekends and holidays, and campground enlargement. As the campgrounds offer more services, expect to pay more.
Many people use the parks for other activities than camping.
None of these activities generate extra revenue for the parks. When the lottery came to California they agreed to give a percentage of their earnings to the California School system in return for a buisness license. After a year or two the state realized that the schools were getting enough money from the lottery to operate - and the state decided not to pay anymore. If funding is cut these parks will dissapear. Some parks can't charge entrance fees.