"* Climbs up tower and replaces part: ehhhh...you win.
You have me on that last one. Replacing parts still requires a human. For now"
I could easily see that being replaced by a modular design of easy to fail parts and a drone. Drone flies up, puts part multitool into slot, unslots it and transfer the one from its drone bay in place. Optical sensors verify the repair and no air leaks.
Manually switching parts is difficult only because the parts havent been designed to be switched by a robot. Once that happens, game over. You've probably seen videos of robotic tape libraries already. https://www.google.ca/search?t...
All thats needed is to design and build the system. We have the technology.
Making it cheaper than paying some forest ranger 50k a year to do it on the otherhand might take a while.