I'd say ignore him until he starts to engage in new things/games live experiences. For you you said he's obsessed with it. And if he really is that fanatic. never indulge his interest for that game only, Will only make it worse in the long run. But to do this you need to be very patient and very rational about it. Which isn't always easy.
Don't know how social he is and such besides game related stuff.
Don't know how social he is and such besides game related stuff.