Reached the top
He mentions "not gaining anything after a five-day trip". As a young person in the left seat staring down 35 years of the exact same I am sure it is demoralizing to someone with a creative mind. Airlines can be perceived as incredibly boring and an uninspired way to live out one's life.
Others, however, are fine with the constant repetition.
Another issue is if one has reached their career zenith then they must turn to their personal life for creative satisfaction. In the past, a pilot commonly earned far above middle class and had considerable resources with which to build interesting personal lives.
I got the impression from the video that the wages were not so appealing. Others here abandoned legacy airline jobs to become real estate agents in 2005-2008.
Easy come then easy go.
SkyHigh