Hey Brad,
I don't know if I agree with you 100%.
I'll agree that for a magic trick, the best course of action is to publish in print. However, flourishing is a very different matter. Very few flourishes are taught in text - furthermore, written instruction would only serve to confuse; the motions involved in most flourishes are so complex, any written instruction would be futile. Though youtube may not be ideal, I would argue that it could be a very valid form of documentation. It identifies the individual, displays the date uploaded, and is (somewhat) permanent. However, the most important part: the flourish is seen performed - exactly as the creator had originally intended.
See you this year in Starrucca?
-Adam