Short and sweet. Crowds in Parks translates to cars and rolling traffic, take easy access away and interior park roadways and you cut out at least 50% of the overcrowding.
This is the part that doesn't make sense to me. The "Fees Are Good" crowd never talk about charging a nightly fee to hike or backpack the Appalachian Trail. Why not?
Regulating numbers would be easy by limiting car access and roads. This will eventually have to be done as the population skyrockets towards 450 million by 2050. Why do places like Yellowstone and the Smokies have car campgrounds for motor homes and RVs? Who's in charge? Haven't we had enough of wheeled traffic in all it's clever forms? Why can't people park in one huge designated lot outside the Park and walk in from there?
Here again, too easy access by the rolling couch potatoes. Close the roads to these places and make what once was remote difficult again to reach. On foot. BTW, there's a 4000 acre wilderness valley in the Slickrock/Kilmer area of NC that has never been logged.