You kid but this is literally what is being proposed in industry conferences: https://www.assia-inc.com/wp-content/uploads/2017/05/TDSL-pr... -- sending ~200GHz [sic] RF into the dielectric spaces between copper conductors and using the copper wires as guide (same principle as Sommerfeld-Goubau lines, except massively MIMO). (the same principle is also quite interesting to apply to above-ground power lines, btw, people have worked on that too)

People will do literally anything to avoid pulling fibre and "sending multi-hundred-gigahertz surface waves along rotten old voice copper" is apparently one of them.

Broadband without wires? Preposterous.