20 years ago when I worked for a large auto manufacturing plant, there was a spot weld line (one of several) with over a hundred people working on it. About 9 years ago I was programming robots for the replacement of that line. The new line had zero people working on it.

I know this anecdote is loosely related but it is a good example of technology replacing traditional jobs. In 30 more years I would imagine technology will be more than capable of replacing pilots if it is not already. The more relevant question is will people accept a pilotless plane. IMHO they will. In the next few years driverless cars will be on the road and we will acclimate to letting a computer do the driving. How big of a leap will it be to let a computer do the flying?