paleo dieting is already a crossfit thing. i turn into a tangle of sputtering rage when i overhear people discussing their paleo diets. at this point, when it comes up, i usually say something like, "oh, yeah, i don't really want to get into it." if i start to actually talk about it, i can't stop myself before phrases like "deeply stupid" and "brain-meltingly idiotic" start rolling out.
interesting to wonder what the next fad will be. i'd be surprised if it were a paleo exercise thing like mouvement naturale, because crossfit has already absorbed that kind of stuff into itself (POSE running, bear crawls during warm-up, FiveFingers and Inov8 shoes), and from where i sit all that seems to be on the wane in the crossmunity. everyone is more interested in olympic lifting than parkour or even gymnastics. actually, i wouldn't be surprised to see an explosion in the number of people focusing exclusively on oly lifting. it'd be cool if that were the next fad. lots of work for the very few qualified coaches. and maybe we'll be good again on a world level in a few years.
also, you might be right about IF. has all the hallmarks of an appealing fad to exceptionalist rich white people. only problem with leangains is that martin berkhan is a sexually insecure 11-year-old boy.