I am extremely enthusiastic about this technology like you! I think it doesn’t help to try and frame this technology within a traditional capitalist view. No one is going to make profit off of this, so talking about business models is completely missing the point. The key to this succeeding is open technology and cooperation within local communities. And we are seeing successes, NYC in particular. In my city too there is a small mesh network, my work is hosting a talk of the founders. I absolutely agree the goal is to envision a future without ISPs
It will have to be a grassroots effort at first, and to me quick and dirty tech has an interesting role to play. Especially looking ahead to the climate of 2020, off the grid communication may become a necessary part of people’s lives. Airchat and Chattervox are interesting technologies to this end.
It’s also possible on micro-local level with wifi. Someone already mentioned Firechat. I built my own version of this (Hot Ninja) project. It’s essentially a wifi server running off an ESP32. It’s fun to activate in a gathering area and see confused people communicate to the message board. Can be battery powered, is very portable.