Anecdotes are not data but... It's taken over 10 years before I can safely send people png images rather than tiffs in my line of work. I'm not switching again

Anecdotes are not data but... It's taken over 10 years before I can safely send people png images rather than tiffs in my line of work. I'm not switching again until the benefits are blindingly huge and obvious. Basically I think you are correct as to why JPEG2000 did not take off.