I think that you're ignoring the reality of getting into the telco business. Google is hardly the first company to jump into the bandwidth market, but without the corporate welfare they got in KC, they wouldn't have been able to build their network.
The reality is that as long as we have privately owned and operated metro networks, google's bandwidth access will be limited to the few metro areas that consent to their access requirements (and that's assuming the big telcos aren't able to successfully lobby against this incentive, as they've been successful in doing in the past).
The answer is publically owned, and privately operated metro networks. This is a dream that will never come to pass in America, and Google's ambition will remain just that: an unrealized dream.
Sorry for being such a Debbie downer, but bandwidth in the US is a really massive problem that won't be solved by one search engine or one company. We really need a national reform effort.