I don't see how it ever comes back. You used to have business people and engineers riding the train. But with Covid the enforcement policies got really bad and the trains and atmosphere are so trashy now. It's far easier for the aforementioned group to just hire an Uber than deal with the crime and trashiness that's plaguing the system now.
I ride the system all the time and I don't think it's trashy. Also there are the new gates all over that block people from jumping in as easily and that has been cut down quite a bit. I think it's tough for Bart to probably come back still because people don't need to be in downtown SF as much as they used to because a lot of people work from home now, but yeah I just don't think it's fair to say that the system is some trashy system. I think it's mostly pretty nice.