A massive advertising campaign wouldn't change anything. Tabletop gaming requires a bunch of free time at the same time and location as your friends; that's hard to arrange, and a TV ad isn't going to change that. Suppose you were new to gaming, saw the ad, and ran out and bought the game? Then what? The reason people get introduced to the hobby by other people is because then you have at least two players. Simple as that.
If you really want to bring more people into tabletop gaming, what you need isn't more push (Youtube videos showing people playing), it's more pull: a good way to play tabletop games online, and a way to hook up with other people doing it that's as easy as firing up your copy of Call of Duty (or whatever) and seeing who's on to play with. Games like chess and scrabble have made the transition very, very successfully. My chess-playing friends play more than ever, with people around the globe, instead of occasional Saturdays in the park or chess club meetings. What's needed is more of that, for other games, and hopefully in a way that doesn't need a new piece of software for each game. G+ Hangouts are almost there, but you can't quite share views of boards or cards easily enough... Tabletop Forge and the like is a step towards that, except it's not quite ready for prime time (at least I can't get it to run in my browser).