Nice to see this topic resurface again. I also agree that a multiplayer persistant realtime DC is the main missing feature in DCS, and actually I think that the kickstarter idea suggested on this thread could be a good idea to get things moving.
There are many references, for better or worse, to F4s DC in the thread. In my opinion, that DC is the main reason why F4 has survived for 15+ years. However, I do agree with some of the comments about its lack of realism, and I would prefer a system that generates more realistic missions and not a wall of migs and suicide missions.
In the meantime, lets hope for a DC in DCS somewhere in the future :)