Mass transit will never be solved.
I think it's time to give up on this dream.
In a sprawled out city like Los Angeles, the suburbs that people live in, are too far away from the job centers. It's even too far away from a supermarket, or the shopping mall.
Mass transit is a failure when it takes 2 hours to get to your destination, when it is just 15 miles away. Where you may have to walk to a bus stop to catch your bus, and then transfer to a light rail line. And then, the light rail drops you off, 4 miles away from where you need to be.
It's easier to just sit in your car, stuck in traffic. At least you have air conditioning in the hot sun. You can listen to your own music. And you won't be in danger of being violently attacked, robbed, or physically assaulted.
But I think there can be a few solutions to the last mile problem.
1. Dockless bicycles. I don't think this can work in America, the way it worked in China. The bicycles are too massive, and can get crammed up on the sidewalk, at some destination point.
2. Dockless electric scooters. I think this can actually work in America. They are small enough, that several units take the same amount of space as a single bicycle.
3. Uber to drive you the last few miles. A taxi service won't pick you up. And it might not even be profitable for an Uber driver to pick you up. But at least this is an option.
4. Fully electric and autonomous robotic vehicles that will drive you from point to point. This has to be the ultimate dream, and can actually be the real solution to the mass transit problem.