Generally RPG's has a rather young fan club. Video games are probably more popular than they ever have been and have more adult players than they ever have but generally the rpg genre is not one that spands the different age ranges.

Most adults are either playing sports games or online games. The RPG genre usually starts dying out in your late teens or early twenties.

RPG games are generally geared towards young people. And when you start getting more and more into the adult world rpg's tend to start becoming a little more childish.

What they need to do is start creating rpg's with a more adult theme surrounding them. There probably are a few rpg's out there like that but the vast majority are still 14 year olds saving the universe.