America is not built for public transit and without huge federal investment in rebuilding communities, that will not change. Simply getting more buses on the road when you're dealing with pretty huge suburbs is going to get very costly -- and remember, public transit fares can't be expensive to pay the costs, they have to remain low. So you're talking about a huge uphill battle with suburb communities who a) don't want "shit" in their backyards and b) don't want to pay for it.

So, this method is easier to roll-out, easier to bring profits from (especially with an ageing population who don't want to live in city centers), and can easily fit into nearly any community in America with ease.

Ideally, you would be right, we would instead be investing in a massive public transit overhaul from trains to buses but as the saying goes, we do not live in a perfect world.