Mesh networks have existed before Bitcoin, and even some people tried to monetize them and somehow incentivize people to "share their bandwidth" (ie. Fonera, etc).

Calling it "6g" or "PoW killer" isn't going to make this old idea any more interesting to anyone. And now Elon Musk is covering the world with 20ms latency links with a mesh of low altitude satellites interlinked at the speed of light in a vacuum (as opposed to slower fiber optic trans-oceanic cables).

5g also has a mesh like function, mostly to the benefit of the mobile carriers.