Interesting thread. I actually just loaded up FS2 again last weekend, after not having played it in a couple of years. I need to catch up on several campaign and content releases.
There was once a long period when I spent a lot of time making missions as well as posting here, but hardly playing the game (except for testing things). After I finished PI, I got back into the actual game for the next year or two, especially the multiplayer side, before eventually burning out on that. I was still reasonably active on the forum until last year, having been involved with this community more or less continuously since 1999. It's been a good run, but you move on eventually. As always, there will continue to be a steady flow of newcomers making up for the people who leave over time. I do still play FS2 every now and then, but not necessarily more so than other games, and spend much less time with games in general than I once did. It's simply one of many "good games" in my gaming rotation that I cycle through over time.