Legacy ISPs managed it somehow? So I don't see why Google can't. Especially since technology has improved (microtrenching and etc.). If anyone, Google has enough money to pull it off and seriously compete with incumbents.
These "legacy ISPs" have, since they first got started and became entrenched, purchased enough legislation to make it effectively impossible for any real competition to take root. Google Fiber's failure was not a technological failure, it was a political failure.
So, Google could spend the money to purge that political garbage. They kind of tried, with pushing "one touch make ready" policy. The stated goal of GF was to increase competition in ISP market. So far their service was while positive, far from sufficient.