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Well, I would say possible but not very likely. It costs a lot of money, and unless the current ISPs are facing a direct threat in your town from Google Fiber, they really have very little incentive. Many, many communities are faced with an ISP duopoly that has to this point enjoyed charging high fees for speeds that are, by global standards, quite slow. Unless Google Fiber is actually announced in your city, ISPs are just going to continue the status quo.
I guess they will: http://www.technologyreview.com/news/514176/google-fibers-ripple-effect/