I'm not sure about that - after a couple of initial waves, interest in the concept does seem to be receding a bit, as the reality of their ultimate pointlessnes

I'm not sure about that - after a couple of initial waves, interest in the concept does seem to be receding a bit, as the reality of their ultimate pointlessness becomes apparent amongst the swell of people who might at all be interested. I'm sure there'll always be a fanbase, just as there are with trading sports-themed trading cards or whatnot, but beyond that? Myeh.