Only had one bad experience with an Uber. Use it weekly to get work due to having shit shifts.
My understanding of this surely is that if they lose the London license, all the drivers will just buy cars from other towns with non-London registered license plates, and carry on working? I went to Stoke recently (Alton Towers) and the driver was telling me that Uber isn't available in Stoke, but it is in Liverpool/Manchester etc, so he just bought a car with a Liverpool reg license and was able to operate in Stoke as long as anyone was using the app.