You'd need some kind of organization, some money, an add compaign, AND somebody most non-gamers know and see who is POPULAR. I think if it lacked any one of those things, it'd most likely fail. The ads would have to last at least six months to see if there is any noticable change, can't do it in just one magazine or one month.
Another reason that this most likely won't happen is that over half the responses on this thread have rejected the idea even before it began. Why? Sure word of mouth is one way, and it's a good way, but it's NOT the only way.
If this 'industry' is going to grow beyond the average-age 30ish people playing today, and become more like an 'industry' and not just the hobby it is, then more non-gamers/non-players need to see this either on tv as a commercial, news reports on the news, or getting popular people like Vin Diesel to go to a big con, like GenCon, and promote it. Where he goes, so will reporters, and the news.
Now, getting him to actually do something like that is a pipe dream waiting to be smoked, but hell, even if a few news stations had a hold of his introduction in the 30th anniversary book and read it on the news then a lot of people would at least think once about it, and maybe twice.
I think this is a good idea for trying to get more people to hear about it, notice it, but it would require some serious resources that most of us just do not have. You might get a decent amount of change if all members of this website donated just ten dollars to the cause, and if you somehow included people from rpg.net, the wotc boards, etc... wishful thinking and all, but unless it somehow gets started, how the hell are we gonna know if it would work or not?
Another thing... word of mouth and some of you getting 3 new gamers a year is fine and all, but that's just 3 people. If you could somehow target more people, to get a growing interest, then how would you do it?