Outside of the hobby, many folks I know and talk to would say everything about D&D games is written just for kids.
At this point, I don't think outside the hobby is a priority. WotC's focus was in getting new kids to play with 4E, and the result was that half their player base defected to Pathfinder. The message was clear. Now, their priority needs to.be getting those customers back, not trying the same thing and expecting different results.
Yeah, there's a bunch of new young D&D players. There's a lot more old D&D players who are now Pathfinder players.