There's probably no reason this can't act as another competitor to fixed broadband in the US market, bypassing one of the major issues holding back greater competition in that market. Especially if SpaceX can get the launches down to a cheap enough point. And it should certainly be capable of acting as a competitor to 4G LTE and the next generation.
I recall some notes from one of interviews with Musk that mentioned a "a plan for poorer countries and a plan for those stuck with Comcast". Not sure if Musk said this personally though, I haven't watched the interview itself yet.
How much data could these push in theory?