Loitering a drone at 65000 ft is just the beginning, even if it has the battery power needed to carry it through the night.
The payload must provide adequate bandwidth and power, even though the power is only what the solar cells can provide and the send/receive antenna size and shape are constrained by aerodynamics. That makes for a ferocious engineering problem.
Getting a bus, as Google has done with the Titan purchase, is a very long way from having a product.