But I think Google Fiber may just be another moat for Google, another way for them to hinder their perceived threats.
When FB was asked about a phone they said that any phone user they'd get it wouldn't move the scale given their 1 billion+ users. Same with Google, it's extremely expensive to wire a significant number of their users, so they are doing this hoping AT&T, Comcast etc upgrade their connection and match the price. Which they might--in the areas where Google is entering. Personally, I would not count of the price being, say $70 for a long time.