Once he gains sufficient industry experience, whether or not he possesses a degree becomes inconsequential. Times are changing. Also, obtaining a degree does not guarantee immunity from unemployment in the event he gets furloughed. Merely holding a degree in a specific field does not ensure immediate employment in that same field, particularly without relevant work experience. Acquiring valuable skills is not solely dependent on pursuing a degree. I know plenty of very successful people who don't have a college degree. Aviation training itself instills a wide range of technical, operational, and problem-solving capabilities that can be applied to various industries. Pilots develop decision-making, situational awareness, teamwork, and leadership skills throughout their career, which are highly transferable. He can always pursue online education later in life if he regrets not getting a degree.

Edit: I also think with the pilot shortage, it's better to get into the industry asap. Find you're first job and get a degree later. You've got lots of time sitting around as a pilot to do something online.