The big problem comes when the government agency running the system can't pay the operating costs to run the service. This is happening in some older cities with growing operating costs for their systems (Philadelphia and Pittsburgh are good examples of this). The Federal government offers big matching funds to build the system, but once a system is built the state or local government is on its own.
when your hood is now a target of free-ranging urban ferals, taggers and break-in artists, it’s hard to see how the property values increase (though there may be some lucky exceptions, I’m sure