I'm going to take a loose stab and say saltwater fly will make a big rise in the next few years. Most of the fads at the moment are just old techniques from 20 years ago that died when the next came out. Take soft plastics, then jigging, then surface lures, (snapper on plastics came in around here) then hardbodys, then the crankbaits such as jackals, then blades and so on. They've all been done a few decades ago, you just have to do your research and find techniques that shouldn't have been put away.