Mass transit can't compete with the convenience of cars. Even in the worst traffic in DFW, the two trains we have are still considerably slower than the roads.
The only mass transit that works is Aircraft.
Other than that, you need highly dense ant mounds for humans in order for mass transit to be profitable. And even then, in those areas you 'll still see cars.
In New York city, it was profitable for Chinese to run busses and it was profitable for people to take a large conversion van and have car pools for profit. That is, until the city shut both down.
In places that are ant piles, the government is also very corrupt. New York city only gives out so many taxi medallions. These permissions to operate as a taxi cost 1 million dollars.
In Europe and Japan, they still make and drive cars.
Overall, mass transit is a meme that is inconvenient, doesn't reduce traffic, cost more than cars, and isn't faster than cars and has limited coverage.
If I were dictator of the DOT and it were up to me, I would make it legal for anyone to operate a minimally regulated taxi and bus service.
Uber and Lyft could hire school bus operators to do private bus service at a low cost.
I would privatize all government rest areas so that a concession stand could be operated under a contract that the operator maintain the lot and the restrooms.
These are things that should happen. Instead we get regulation that stifles innovation and wastes money. We get pissy fights over things.
An example: Recently the same government that operates busses in FW built a train line to the airport. Several of these stops have parking so that riders can drive to the train and then drive home. At the Airport Station, they had a regulation put in place that nobody can park there for more than 18 hours because the government agency didn't want competition to incur between the Airport's parking lot and the private long term parking lots.