If you think about why Google was doing Google Fiber, it was to increase users' bandwidth, not really to take over home internet service. Their announcement of city selection resulted in incumbents in those selected areas doing rollouts even before Google could get site selection done. At that point, the mission was accomplished, and Google didn't need to do anything.

But, they can't really do that trick a second time, so everybody else is slowly waiting for the existing lines in the ground / on the poles to deteriorate to the point where incumbents have to rollout new stuff.