Mode s equipped aircraft seemed very few and far between.
Rod
Mode S is here to stay simply for the reason that the people who count ie IFR traffic have all gone Mode S
What Joe Bloggs bumps around with below CAS has remained an irrelevance.
You say few and far between but not up in the airways.
The costs of changing again would be massive so until something SIGNIFICANTLY better comes along its here to stay for no other reason than thats where everyone went.
Pace