What really dictates how much a person should get paid? Well no one really knows. Society has set pay scales for individuals within different industries based on a.) education standards required/attained, b.) cost of qualifications and c.) relative or perceived complexity of the job.
Whichever way you look at it, our job is perceived as very expensive to qualify for and relatively complex to do - by 90% of the population. Whilst an airline pilot's job was indeed very complex and tough 30 years ago, thanks to human advancement we have been able to reduce our workload by making things simpler and introducing automation. However, these concepts are not limited to the job of airline pilots. In all industries, the level of actual “work” we do on a daily basis is reducing. It’s the same wherever you go. So this argument is very weak.