I agree with you, that tramlines and public transport are great, but it suffers from the same problems that taking the bus suffers from, the fact that tickets usually only work in one state/county, and you need to know the timetables. I think that the benefits of tramlines are there, but more people value the spontaneous use of a car whenever they want over, highly efficient inter-city public transport. (My bus card that I use daily, only works in my county, but if the government had a system for cross-county travel then it wouldn’t be an issue.)