The Demo Team is, of course, the best vehicle the game has right now. A group of people who have been passionate about the game well before, during, and after the current renaissance is worth its weight in gold. Whether they are hosting basic demonstrations with another friend already familiar with the game, showing off the rules to potential new players, or managing a small Grand Melee/Grinder/Whatever, you can't put a price tag on that kind of advertisement.
What (I suspect) a lot of people are not going to want to hear, is that the next best strategy is competitive play. As awesome as its members are, there is a limit to the reach of the CGL Demo Team. That's not an accusation, a criticism, or a weakness, it's just a fact of math, time, and geography. A local tournament hosted by your FLGS, your school's gaming club, or an upstart gaming convention is a terrific way to attract attention to the game. That's not going to happen without a basic set of competitive play/tournament force organization rules, though, because "just take whatever you want" is, has always been, and will always be terrible advice when "whatever you want" refers to 100+ possible options that all do very different things at varying levels of success. Some people will appreciate that sandbox approach for what it is, but others are going to want rules, suggestions, and limits before spending money on stuff.
A basic set of tournament guides, rules, and restrictions allows for people/clubs/cons/shops with no current affiliation or access to the Demo Team to host fair, balanced, and accessible games that can be enjoyed by new players and veterans alike. Does that pose a potential threat to the ages old beer-and-pretzels, everyone has access to everything because salvage approach to the game? Maybe. It definitely might. But something is going to have to give somewhere. Either we take this opportunity to help the franchise grow by creating new mechanisms and opportunities for new people to enjoy the game without direct interaction with CGL or we just keep doing what we've always done and eventually watch this new wave of excitement run out of gas.