The problem is that the few remaining users don't spend enough to maintain the network, much less make money on it. In the capitalist system that means no more payphones. I think AT&T got out of the business in 2007.
But there are still advocates for the payphone, I just don't think they have much chance.
http://www.consumer-action.org/coali...ublic_communi/
I have noticed a growth in the emergency phones though, but I think they just go to a call center.