You're never going to see the price of airline tickets fall by 50% due to eliminating pilots, or likely any other reason. The companies will just use the increased margins to pad their own pockets while probably raising prices under the guise of innovation or other additional features.

With the exception of a few markets that have price volatility, deflation is a really rare thing. What people get instead are products that are packed with either more performance or more features(whether useful or not) and that is justification for the slight price increases that we see from year to year.