Even if Google Fiber is 100 times faster than regular broadband, what good will it be? Within the winning city the Internet might work at blazing-hot speed, but the "normal" speed of the outside world will be a debilitating bottleneck. At least until Google Fiber gets rolled out sufficiently enough to take on a bulk of the data traffic.
It's like trying to win a contest for an SR-71 Blackbird without having a runway to launch it from. No doubt that it'll look real purty sitting in your backyard, but what's the use if you can't even fly the thing?