lol. lmao.
No, the "should" should be defined on a performance basis. I'm not enough of an expert to outline a comprehensive set of performance levels that should be achieved, but at the bare minimum, it should probably be cheaper than driving for any arbitrary trip, and should probably usually be faster than driving.
Obviously, investment should be prioritised based on how much good it's going to achieve, but the goal should be defined based on, within the bounds of what's even possible for a society, providing a certain degree of service to everyone.
