I appreciate you actually taking a moment to think through the cost, but I think we could start with some pragmatism and look to run wires to people who are within a reasonable range of existing systems, of which there are many.

Clearly not every public road needs wiring. Then, consider that you could run wired connections to wireless access points to increase high speed wireless coverage. 1 wire to light up dozens of homes in areas which currently have no service beyond DSL.