Wired UK is pondering the question, "Where do game genres go to die?" As alive and well as the Wing Commander community is, it's still hard not to notice the lack of new space sims on the market today. Their article also addresses adventure games and 3D real time strategy titles, which are conspicuously absent these days too. The author then looks to fan mods for some relief, and hasn't found it yet. As Gavinfoxx points out, he needs to check out some awesome WC mods!
Remember Wing Commander? X-Wing and Tie Fighter? Day of the Tentacle? Homeworld? All huge games, and all part of genres that now barely exist.