Couple of notes: Greyhound started dropping routes back around 1981 when they were deregulated, then they were allowed to purchase Trailways in 1985, effectively creating a monopoly.
I am of the opinion that too many people in the US would rather hold onto their car than a roof over their heads, in part because in many parts of the country is it almost impossible to live without a car. There was a thread on here a while back about some homeless that had gone from middle class to homeless, and were living in their cars.
Aaron