EXACTLY the point...
Indeed. I don't want to dismiss transit completely, it definitely is a practical way to get around in densly populated areas, but for long distance traveling or going from one suburb to another for work, it doesn't work, and it isn't cost effective to build out such systems to serve these areas.
The government would be wise though to not make driving too expensive, without revenue from gas taxes, all mass transit systems would stop running due to lack of funds.