Removing the driver mainly removes barriers to running late - meaning things like drunk driving can be significantly reduced since transit in the US is virtually non-existant at drunk’o’clock, effectively pressuring people into bad decisions when their judgement is the poorest.
If a route is uneconomic, that’s going to be the case without a driver too.
Infrastructure is vital to economic and other activity. It needs to be treated as an investment or necessary cost, not a business. Doing otherwise inevitably results in collapsing bridges, toxic spills, and other symptoms of neglect as corners are cut to maximize profit.