I don't know, I definitely overly simplified the task but
https://en.wikipedia.org/wiki/Guifi.net
a spanish mesh network was born in 2004 due to lack of service from said ISPs and in 2018 this network continues to grow to this day - "over 46,000 km of wireless links" that seems pretty large scale.
110 new nodes last week https://guifi.net/en
It's still very niche. By mass market I mean your everyday teenage girl (who are not into technology), average FB user, mom and dad, grand parents. Just basically the vast majority of people. Anything that requires an extra step is a bid no no.
true, maybe approaching it from a enterprise POV and attack that way. there are definitely scaling issues with WISPs https://www1.icsi.berkeley.edu/~barath/papers/celerate-dev15.pdf
but recently a 10gbps omni AP came out https://www.ignitenet.com/products/ml-10g-omni/
which can probably handle about about 500 CPEs (maybe more idk, im rather new to this), WISPs are mostly used in Rural areas, but i think with this newer tech we could see these Fixed Wireless providers have more of a presence in cities