Well Ericsson would say that, wouldn't they
Not that I entirely disagree. I'm just saying. Loon, or something like it, may be useful for any remote area with a low population density; the kind of area where building out a physical network may not make sense. Satellite internet remains slow and expensive. I think the real problem with Loon is not going to be providing coverage, but might actually getting people to use it. Surely their must be places where people have no interest in the internet*?
* No, not Africa, where everyone, down the family living in the last mud hut, craves it.