Humans do immensely dangerous things for fun all the time[1]. That isn't going to stop. People will continue to drive on private roads pretty much forever.
Doing things that are dangerous to yourself is fine. The problem with driving is that it's dangerous to your surroundings. I'm all for a future where driving on public roads is banned and driving on closed courses and race tracks is the worlds new favorite past time.
Humans do immensely dangerous things for fun all the time[1]. That isn't going to stop. People will continue to drive on private roads pretty much forever.
[1] For example https://www.youtube.com/watch?v=-C_jPcUkVrM