Already happened ...
We already went through that phase back when the Highlander was popular. You don't know how many people showed up wanting to learn how to use their stainless steel with plastic handle Highlander swords. Boy were they disappointed to find out that it takes more than a couple of months! Most of them didn't last through the first couple of weeks, but a couple of those Highlander wannabes turned into good students and are still with us today.
You used to have the ninja all over, then you had the jujutsu craze. Lately it's been aiki. Aiki-something is everywhere now. I guess it's gonna be our turn again, kinda like bell bottoms from the 70's, they just won't go away!
Cheers,
Paul Smith
"Always keep the sharp side and the pointy end between you and your opponent"