The pilot has to be there anyway, right? So where's the profit in fixing this? And so it doesn't get done..
Until the technology is good enough for taking the pilot away, it's not a gain.
If that were true modern airlines wouldn't have autopilot.
And by the way, there's an ongoing discussion on airplane groups about all the new failure modes created by the autopilot-pilot interface. It creates plenty of problems.
Regarding drones, I suspect that you are at least partly right. There is a lot of interest already in drones as inspection platforms. Perhaps they will go farther as drones get more commercial aviation clearance.