These sound strange, but are a good possibility in the future. As part of a university project we had to design a platform capable of doing this, although opted for a 20 day endurance UAV which was solar powered - sounds crazy, I know, but there are working versions such as HELIOS
Sounds great to me (Telecom NZ is not my favourite company on the planet at the moment anyhow) & the speed sounds great, as a researcher I spend a ridiculous amount of time waiting even on high speed (for NZ anyway) broadband. but wouldn't they be a bit vulnerable to weather disruptions?