You can do something different and stay with a career in aviation. There are plenty of people who run businesses on the side. Sullenberger is a case in point. His co-pilot was building houses in his spare time.
If it is successful enough you can give up flying, but you do not have to. This is nothing new. Dynarod in the UK was started by a Pan Am flight engineer. I know of plenty of doctors, dentists and other professionals who combine in this way. So it is not limited to business people.