So when another ISP shows up and wants to string cable all over the poles...guess what? They're turned away. Verizon FiOS found this out when trying to get into markets where AT&T had the telephone franchise.
Call it a monopoly, call it anti-competition. But America is huge. There's no other way to get a company to invest in so much infrastructure to cover all of the land.
I worked for a city-owned electric utility that would regularly negotiate with outside entities to do pole-attachments. We did fiber loops around the city and started to offer Internet service. When it looked like we might actually make some meaningful progress, Bellsouth and Cox went to the state government and got a law passed that forbade ANY governmental organization or political subdivision from getting into the telecomm business.
If we had the national political will to insist on a competitive telecommunications infrastructure, we'd have one. I'm happy to see that some ISPs are giving it a go. Unfortunately, the capital costs are so high that it's hard for an upstart to really gain traction.
Our best bet for a truly competitive marketplace is for the CableCos to finally get into the business of doing SMB (small/medium biz) customer service that gives the ATT/Verizons a run for their money.
In Florida, prior to the deployment of Fios, as a competitor to cable television, Verizon lobbied the Florida legislature to rescind the minimum service level requirements to offer television to all citizens.
As a result, there are random neighborhoods with Fios access and others without. Verizon cherry picked the neighborhoods it wanted to service.
As you pointed out, the real problem seems to be the politicians.
I wish it was different but telecom market domination is close to network neutrality in being out on the minds of the citizenry. Unless you can connect it to jobs or taxes, it's unlikely to interest any outside of a select few.
Bring on the FTTH providers!