Have you thought about starting a club of some type that your ds would be interested in? We used to host a robotics club at our kids' elementary school just so that ds could have a non-sports-after-school club to participate in, and once we started it, other like-minded kids came
If you're anywhere near a city of any size, that has either an art museum, a history museum, a science center, or art supply stores, you might be able to find some kind of either science or art class.
My kids have also been interested in photography... maybe start a photography club after school? Or a learn-to-program club or even a book club?
If you don't have the energy to host an ongoing club, another idea is a one-time thing that would focus on science or something your ds likes.
Honestly, I'd be very surprised to find that the majority of other parents of 9 year olds in any area are letting their kids play Call of Duty - I'm not surprised that kids are, and I totally understand how your ds may really only be closely exposed to kids who are... but really.. reach out... there are bound to be other parents out there who aren't into it
Good luck!
polarbear
eta - have you thought about Boy Scouts? I'm not so much into it, but it was fun for my ds, and it was a haven for a lot of kids who weren't into sports and parents who weren't into video games.
