@oceancrosser:
I believe that the list of mid-airs could get very long. In Germany one could include a lot of collisions between gliders (which is of no concern on pprune, though).
In your list, 8 mid-airs have involved light a/c and fighter a/c, which don't have to be equipped with a transponder or may have
turned it off. I venture to doubt, that these collisions would have been prevented if the aircraft were equipped with TCAS.
The TCAS approach on avoiding collisions does not include ATC, it only works with a/c carrying painting transponders. It may be possible to solve the issue of informing ATC on TCAS RAs, but I don't believe that it is feasable to solve the issue of including non transponder a/c with the current TCAS devices.