We've tried, man. Billions of dollars were given to Verizon, AT & T, etc to build out infrastructure. They took the money and did little or nothing. We have "regulatory capture" which is where an incumbent lobbies and gets state or federal regulations that blocks competition. A widely cited figure states that the average broadband customer costs Comcast less than $2/month for broadband internet. Yet they charge more than $50/mo to supply it and recently rolled out data transfer caps. Without any real competition Comcast, et. al. can do what they like.

Google's switching to wireless is in part an acknowledgment that competing in the wired space is costly and fraught with hurdles including lawsuits from incumbents. Could we wire the nation tomorrow with gigabit everywhere? Well not literally, but if there was a "moonshot" program that captured the public's imagination yeah I'd imagine we could get it done in a few years. We've done it before when we really wanted to - the Rural Electrification and Highway programs are two examples from the last century. But it would represent an incredible change from how business is done today and the resulting lawsuits would drag on for decades after the work was done.