Those are likely great options for people and small groups that don't have other options. At the same time, I doubt you'll see many companies jumping to provide that service, at least not ones that have the experience to handle it appropriately.

Wireless internet makes for a very poor product to sell, because the service is unreliable, and often has problems exactly when people want it most (during inclement weather). Also, customers often have a problem dissassociating problems that should be expected with the service from problems with the service provider. It's probably not very gratifying to provide what is often the only option people have for high speed internet to have some subset of them that don't understand the reality, or are just too upset to care, disparage your name online. It also probably doesn't lead to securing additional contracts easily, and as soon as other connectivity does become available, your customers will leave at the earliest opportunity (there's not a lot of friction to signing up somewhere else when the service is currently down).