Nobody is arguing for banning personal vehicle outright. We should just stop attempting to plan ultra-dense urban environments around the least space efficient transportation options. Many public transportation systems already operate a 'park and ride' system by which more remote users are able to park their vehicle at a distant hub and then ride public transportation into more dense areas.

Also, assuming that a future transportation system must look exactly like the one we have today - but bigger, is short sighted. If more people are needing to have a personal vehicle option in an infrequent manner, services to provide those vehicles will be required. Just because you personally can't make it work tomorrow doesn't mean that the goal of robust public transport in urban areas is infeasible.