I'm not sure. I could see that happening but it seems like they aren't expanding in areas they already have service set up in. For example in my area it is available in the city and surrounding suburbs but won't expand that area to any of the surrounding towns. This is in Western New York, specifically Erie County that has a decent sized population of townships outside of Buffalo and its adjoining burbs.

I feel like the cost of running lines of fiber optics hits a brick wall if x amount of miles is needed per available customers and Google is never going to expand outside of Metropolitan service for that reason. But that's my 100% unfounded guess based off nothing.