Instead of coming up with easy radical solutions that won't ever see the light of day in places where people's ability to lead a normal life depends on having a car (which is heavy majority of places in the US outside of NYC and, to a less degree, maaaaybe a couple of other major cities), it might be more productive and efficient to work on solutions that are more difficult and less sexy, but actually have a possibility of being implemented and improve the situation. I am aware that this horse has been beaten to death and some more, but just off the top of my head:

* Physically separated bike lanes and independent bike routes that are efficient in getting people places they need to be. A somewhat successful example of the latter (that keeps expanding and improving): Atlanta Beltline. Doubly impressive, considering that Atlanta is one of the most car-centric major cities in the US with absolutely horrific public transportation and no central "core" area (it is very sprawled, similar to LA).

* Hard push for expansion of public transportation, which, most of the time, is blocked by NIMBYs and other busybodies that always use the argument of not wanting to have more "undesirables"

* More creative and complicated ways that I cannot list off the top of my head

tl;dr: complex problems require complex solutions. If you expect to solve those problems with radical "slash-it-all" solutions, then I would not hold much hope for those problems to be solved at all. It's like someone looking at an existing complicated piece of code for a complex problem, calling that code dumb and difficult to read, and then coming up with a simple solution in a few lines of code, without thinking through all the edge cases and possibilities.