Will they be able to keep the bums off the trains unlike BART?
Only if they crack down on fare scofflaws and have a conductor or two on board to maintain order.
Then there might be complaints from aggrieved individuals who are the focus of the train employees who want to maintain a clean, orderly, and safe environment for the other passengers.
And I fear the "victims" will receive more airtime and press for their complaints, and the whole thing will go downhill from there.
A civil society is a precondition for safe public transit.