This post has made me laugh sooo hard!!
Trust me...there will never be in the next 100 years a pilotless aircraft flying passengers around the world. When you have the millions of Aircraft constantly moving around the world in unending changing environments and situations it will never happpen. Machines would have to have the capablility to make decisions, and make the absolute right decision in every instance, hundreds of times each and evey flight. There are millions of circumstances that many are vague and need the many years of human experience and insight coupled together with knowledge and training and proceedural discipline just like any other professional occupation, that keep the millions of passengers safe and flying every day.
Comparisons to driverless trains on rails? Hahaha....don't make me laugh so hard!!