There are other huge issues with having things way up in the air. The cell phone companies found that instead of cell phone towers they could have balloons acting as towers way up in the sky eliminating dead spots and increasing coverage with less equipment. The problem is not that it would work and be cheap but the array of problems associated with having the balloons up and dealing with the various govt. agencies from federal to local codes. It proved to be so much red tape that the idea is currently not moving forward. I suspect that this will encounter much of the same resistance from the same govts that are funding the developments...crazy world we live in.
Life is tough, but it's tougher when you're stupid.” John Wayne