Although maybe not the sole reason, I'm guessing it is a major contributing factor.
For those who are reading this and don't already know, TWC, until recently, was the major cable provider for the Kansas City metro - Comcast had some of the more distant Missouri suburbs, and TWC only had the ever-changing entity that is Surewest/Everest/Consolidated as a minor competitor in a part of the metro. This year has marked a big uptick in the Google Fiber rollout, especially through south KC, and parts of Johnson County.
Of course, Google isn't saying what their subscription numbers are like. I've seen poll-based estimates that they are now providing service for 1/2 to 4/5 of the homes in areas they service.