Organise demos at your FLGS?
Whilst full colour beginners packs, glossy con packs, boxed sets, Paizo-style art and so on are all laudable, they require a significant financial investment that, really, only companies like WotC have the capital to produce, market, distribute and support to make it worthwhile. For all its success, Mongoose doesn't have the same resources on the same level (although, who knows, perhaps Matt thinks such things might be worthwhile) and can't afford to produce without a guaranteed ROI. And its ROI that drives such projects; it has to.
Fan-proselytizing though, through cons, FLGS demos, spreading the word on forums, and trying to bring new people in under different methods, like online games, will be far more effective. Cerebro's players packs are awesome, I think, but should be used as an adjunct to what I'm talking about here. Even the glossiest, simplest, beginners'-focused ruleset is only going to be as good as those who take the game and put it to work practically.