Satellite broadband is likely to always be an order of magnitude more expensive than terrestrial. It also has a very limited capacity in any given area. I don't know if they're pursuing this, but at Teledesic, we looked at hybrid models where when demand got large enough in any given geographic area, you could use a blimp to serve customers in the existing spectrum with the same user terminals. So, it could prove very complimentary to Loon (assuming both actually work).