I think LW can become a community and a cultural movement that promotes rationality and humanist values. A movement that has the power to steer history into a direction more of our liking.

<blink> Steer history?

When you said "cultural movement", did you really mean "social and political movement" for it is those which steer history?

And what gives you the idea that LW could become massively popular, anyway? There's nothing here particularly interesting for hoi polloi.