I was just there, and parking was absolutely insane. People parking anywhere and everywhere because the lot was full. If they charge for parking I suspect you are going to see the roads even worse with people squeezing and blocking streets more than they do now.
Personally I'm ok to pay a little more money camping if it goes to the upkeep of the park. Shenandoah national park in my state you have to pay an entrance fee and yes separate from the camping cost. Haven't been up that way since Covid so not sure if it's changed any.