That's a pretty big if. There's a very real possibility that the same municipal governments that granted the cable monopolies in the first place, will either license the network to an ISP that will either become Comcast-like (monopoly lazyness does that), be bought by Comcast or actually just simply is Comcast (remember, the municipalities have a "good working relationship" with Comcast) or they will setup their own ISP, which might get off to a decent start, but will either make money, and then go on to be milked hard, or it will lose money, and will have to fight with the fire service and the water utility over every last penny for infrastructure upgrades ("What do you mean you need a $5000 router? I have a $30 router at home and it works just fine! In fact, I'll go to Best Buy myself and get you a few of those tomorrow. What the next item on the agenda?").
But IF they do it right, it would be a great solution.