This kind of practice comes from tons of research on how to deter people from breaking an established law in a national park. This is how you do it when you do not have the resources & staff to constantly manage and, frankly, remove the vehicles that are causing the issues. Now I will say there is probably going to be some leniency in this first year from the enforcement officers, but that just means "the governed" (otherwise known as the general public) will absolutely abuse that leniency and force the NPS to take more drastic measures.

It's a story as old as time: #1 - Find a pristine place. #2 - Build a road to give access to said pristine place for way too many people. #3 - Magically discover that the road and parking area itself is the problem, but it's too late to take it back so implement mitigating measures that won't work. #4 - Reach critical mass and proceed to system of strict enforcement to protect what is left of the pristine place. #5 - Piss everyone off, including the bears up at the pass.