Briefly, here are some of the challenges WISPs run in to as they scale:
-Getting contracts with relay sites / towers / places to put their wireless infrastructure. This is one of the most time consuming parts of building a WISP, and it's primarily just about waiting and red tape and making lots of phone calls.
-Geographic limitations - IE we have our little valley covered and we've got as many customers here as we're gonna get, now what? It would cost $XXX to go over to the next town/city/county and we don't really have that or don't have the resources to feel like we could handle that logistically, so we're just gonna stay where we are.
-Network upgrades. IE 10 years ago a 5Mbps connection was pretty good! So we built a network that would deliver that. Now customers want 50Mbps, and the technology is there, but we don't have the capital or the know-how to go do a full network and technology upgrade.
I was probably imagining it or projecting my perverted ideals but what a beautiful, refreshing moment it was :)
There are of course also businesses in this market that want to continue growing and I don't think there's anything wrong with that.