Comparing the two is exactly the role of governments (and by extension, us as their supervisors) as there are only finite resources to allocate.
I don't think it's quite true to say that after 20 years we would be left with nothing. If it encourages more people to take the bus instead of driving then it would decrease traffic and pollution. Although in cases where buses are already in demand, adding new routes or increasing bus frequency on existing routes would be a better use of money.
I don't think it's quite true to say that after 20 years we would be left with nothing. If it encourages more people to take the bus instead of driving then it would decrease traffic and pollution. Although in cases where buses are already in demand, adding new routes or increasing bus frequency on existing routes would be a better use of money.