I take issue with that One Shoe.
For One thing. Our man is going to have to be happy in light aircraft. Elementary training for an airline career is conducted in such machines. I have taken a few people up as passengers in light aircraft and have been told by a couple that flying in light aircraft is not their thing despite having flown in airliners to Ibiza, Carrib, LAX etc, due to the fact that one can feel the motion of small aircraft a hell of a lot more. So it follows that if you are going to initially train on a light aircraft then see how you feel in one.
Also, don't forget that the aviation world does not end with 737s. There are many folk earning a living doing completely different things in aircraft as a profession. Air Taxi, Instructing, Police work, Ferrying, Bush Flying, NGO aid flying... and not every one is just biding time for an airline job. Many are happy in the shere of aviation they are in
Bill