It seems to me that the number of Thelemites in the world is growing, though I would wager that only the tiniest fraction of them have even heard of Aleister Crowley, and that an even smaller fraction of those actually label themselves "Thelemites."
As I understand it, it is very possible to seek out and follow one's own will without resorting to the symbolism and mythology of Crowley's system. Given this, I think that in some ways the label "Thelemite" is limiting. Greeting others with "Do what thou wilt," discoursing on the Book of the Law, and engaging in other "freaky" behavior around others may in fact be counter-productive to the promotion of the 93 current. People are likely to be alienated by strange behavior, rather than intrigued by it.
I think it's our responsibility to promote the Law, but not necessarily insist that others adhere to the label. In what ways can we expose others to the philosophy of the Will without alienating them?