It is a shame to hear you know of no one who picked up the interest in aviation post Cadets – however given your negative and pessimistic outlook on life, am I surprised?
I myself when I left university worked for an aviation company – several of my colleagues were fellow CFAVs all for the surrounding Squadrons.
I know one other I was a Cadet with who works for BAE Systems
Another Cadet peer is a BA pilot.
I know several former Cadets who have a PPL today, including myself all influenced by the time spent flying with the Cadet organisation.
One friend I know has taken his parachute course experience with him into his life after Cadets and remains his hobby after Cadets.
I know CFAVs who work in the aviation industry, at least two work in Air Traffic Control, one builds aircraft, another manufacturers components. I have two friends who work at airports as customs officers/security, and one of our Staff team works at an Airport. I also know of two former-Cadets who have become cabin crew.
The CWO from my days as a Cadet works for a space industry, their brother now a Sqn Ldr in the RAF.
One friend joined up and even joined the RAF Red Arrows Team as one of the “blues”, three others are aircraft technicians, another as RAF Regiment, two have joined the RAF as nurses.
As I sit here and type I can think of more who have joined the Army
I even know a CFAV who has since joined the RAF Reserves such was their passion and interest in wearing a blue suit.
It could be argued that the ATC as was had a limited influence on their career paths or choice of hobby, at best steered them towards an area of interest, but without much effort I can think of 15-20 names who have moved into an “aviation themed” career or hobby after being an air cadet themselves and at least half again who have joined up as a regular or reserve; that has to say something for the experiences and influences the organisation has had for those people to consider an aviation based career or hobby.