I've said this before on the camping boards. I don't think they ever build another campground, despite massive demand, because there is no way a campground generates similar revenue per guest as the resorts, but I don't think they get rid of The Fort since it is basically a sunk infrastructure cost and is always jammed, regardless of being one of the most expensive campgrounds in the U.S.
That being said, there are such simple ways they could increase revenue from the campground it always blows my mind they don't. For one thing, limit the length of stays. When people come and stay for a month, you get low revenue annual pass folks, or people who stay in the campground more than go to the resorts. If they limited it to 10 days per month, 30 days in a year, revenue per guest would go up as you got more park goers and fewer long time stays. Cut it down to 5 people per site, and charge $20 per person over 5 per night extra. That would also help with the phantom booking problem. Tie stays to tickets. If you don't have a park ticket for every 2 or 3 days you stay at The Fort, you can't stay for more than 3 days. Tie holiday weekends and special events to tickets. You want to stay at Halloween? You need to have a park ticket for every day you stay.
If they did simple things like this, that campground would generate significantly more revenue. It would still lag, since campers tend to bring their own food, but it would be worth so much more money. And if it makes more money, they are less likely to do something stupid like bulldoze it.