Advertising doesn't work.
At least, not the advertising of the new 3.x Basic Edition Box Set that encourages people to play D&D.
If people don't know what Role-Playing is, or what is involved in a "live" RPG, they'll be just as likely to completely overlook the box as anything else in which they're not interested. Personally, I would love to see an infomercial for D&D. I don't know how interesting it would be to watch someone PLAY the game, but if they explained the basic rules and demonstrated a small adventure, maybe they might spark some interest. But I've always found that word-of-mouth is still the best way to advertise RPGs to new people.
The d20 market is flooded with new material every day, and it is a lot like computer software. Some companies make great products, some make poor products, and some make products that are barely compatible with the machine for which it was made. And since the machine -- d20 -- is constantly changing, it is nigh impossible to keep up. I completely agree that introducing today's d20 to new players is mind-bogglingly difficult, given the tactical nature of the game as is. But old players hate going back to basics; I know I do. Sometimes, though, I look to my Blue Rose campaign setting and hope that I will use its simplistic engine... and then I look at my collection of Monte Cook stuff and want more. It's just... too... much.
Teens are better at RPGs and interpersonal communication because, as a teen, there isn't a lot much more they can do or of which they have complete control. The older one gets, the more responsibilities are thrown to them, and the less time they will then have to indulge in any kind of personal hobby.
I mean, when *I* was a teen, I was a geek. As a result, I wasn't a very social person. But, put me in the right element -- creating a magical world for a group of six, every day I could, many times 4-7 times a week -- and I shone; creating mass amounts of imaginary personae came easily, as I had (and still have) a very active imagination. What else did I have to do but go to school and play video games? And what else did THEY have to do? Sports, dating, movies... but they still wanted to play 8-12 hours of D&D a day.
But look at the same group now. Ten years later, we have relationships, jobs, kids -- all of which place pressure on our free time on a daily basis. Nowadays I'm lucky IF I can get a short 4-6 hr. game once a week. We already have 3 or 4 campaigns on the go, and there just isn't enough time in the day to advance any of them.