It is easy to write that, but I invite anyone to pencil it out. Same situation with healthcare. "Billions" seem like a big number, until you dig into the cost of emergency heart surgery, NICU babies, cancer treatments, etc.

Note the problems you will be up against.

Homeless populations are likelier to have more mentally ill, drug addicted, and people with criminal history among them. Any people around proposed sites would be obviously opposed to any new facilities being built near them. That is why the west coast states pay $200k+ per key to buy hotels and motels and convert them to homeless shelters, because locals cannot fight it since it is already zoned for multi tenant housing.

And then you have induced demand. Taxpayers in any other place would have no problem keeping their taxes lower by paying for flights and buses to anyone who needs them to get to SF.