You can take it all the way to having Virtual Air Traffic Control systems, staffed by other players - eg the VATSIM[1] community.
I was part of a survey from MS about what I'd like to see in the next version of the simulator (this was after FSX went away but before "Flight). The survey asked a lot of questions about my thoughts on making the sim more goal/mission oriented (essentially, more of a game).
I made it really clear that I thought that was fine as an addition but should not replace the current real-world functionality. Give people the option.
I can't imagine my answers were that different from most long-time users - basically it needed to have all the features I mentioned above, plus an open SDK for 3rd party developers.
MS didn't listen and "Flight" was a huge disappointment - at which point I moved to X-Plane.
Hopefully, they've gone back to their roots with this new version because it looks absolutely amazing.