The natural progression is car -> bus -> train. The Uber thing is now making congestion really bad where I live too. There's a town in New Jersey[1] that is opting for Uber instead of building a parking structure. Even though that is replacing cars with other cars, it still roughly doubles congestion; Ubers leave empty. More cars clogging the roads is bad for timely transportation and bad for the environment. Not just green house gasses, but motor oil, tires, litter. It's really unfortunate.
[1] http://www.theverge.com/2016/10/3/13147680/uber-new-jersey-f...