WHERE. IS.
NAUMACHIA?
I realize there's quite a few space sims out there, and a few of the newer ones have even been listed in the featured article, but between the above and Infinity... I think such have the power to bring back the genre.
I personally believe that future space sims will become successful not just due to simple mechanics, but rather, ease of use with realistic physics, or at least what I'd call "relative realism." To me, most of the fun in flying comes from... flying! And flying in space does not mean it needs to be hard, but it also doesn't mean it needs to be WC or Star Wars or FS all over again. It's always going to be fun, but I think it feels a bit too "arcadey." Instead, I think gamers or new simmers will be impressed by the speed and power of realistic flight, while not being overburdened with a keyboard full of controls. In that regard, FS is most ironic in that, in its vanilla form, it is possibly the most arcade-ish feeling sim I've played, while it needs full simulator-style command over the keyboard to operate.
Thus, going in the opposite direction is possibly the best route to take. Many people want to fly about in space, but it needs to feel like you're in space for one, and it needs to be fun for second. Someday, maybe.
