Out amongst the general public (remember there are LOTS of knife users who have never even heard of Bladeforums.com, much less Talonite, G-10, ATS-34, BG42, etc. etc. etc.), I'd guess that neck knives aren't even a blip on the radar. So I don't even think they qualify as a "fad." With that said, though, I do think they're a passing fad. Why? Because we knife folk are a very trendy and fickle lot. Think about it. There was a time when EVERY man carried a two-blade Barlow style knife, my Grandad included. Years later, everyone seemed to prefer the stockman pattern and Barlows fell out of favor. Then came the Swiss Army knife or utility/scout style knife. Then you were nobody if you didn't have a large Buck 110 on your belt. Who carries those now? Not nearly as many as carry Leatherman tools on their belts, that's for sure. And usually, if someone does prefer a large, one-blade folder, it's clipped to his pocket, not hanging in a belt case. In other words, knife popularity comes and goes in waves. So yes, I think there will come a time when few folks are not talking about neck knives.