Maybe, maybe not. I don't think there are ebbs and flows in the sales of SAK's, like there is in the knife nut world, where they all are going to buy the next 'big' thing'. They want the latest super steel of the month and any minor deign change in a lock that makes a bit different and therefor "better". I don't think, aside from the obsessive fan boys on this forum, that SAK buyers are repeat buyers as long as they have one.
My father in law, Bill, was a perfect example. Bill had a beat up old Wenger SAK, and he took it on his canoe trips, camping trips, and day to day. He never bought another knife because he had his SAK. Like a lot of themes from his generation, he had that one pocket knife, and unless it was broken, lost, or stolen, he didn't need to go buy another one. Bill was a meteorologist for the U.S. weather service and specialized in hurricane study. He went on expeditions to study weather phenomenon all over the world and that SAK most likely had 500,000 miles on it. Even after he retired to a little house on the intercostal waterway to indulge his passion for sailing, his SAK was in his pocket. he did after 30 years or so wear it out, so he bought a new Victorinox. That one was with him till the end. That was it, two SAK's in the course of his life. All the camping and traveling Bill did, he knew he needed a pocket knife, so he bought one. One. Not exactly a repeat buyer to count on.
I think the bulk of SAK buyers are like that. They need a pocket knife, so they go into a sports store, look around, and there is all the nice shiny red handle SAK's hanging on the peg. So they pick one. They now have a 'knife'. They are content. Being on this forum it's easy to get a veery perverted view of knives, and the knife world. But we, the forum members, make up maybe about 1% of the knife buying public. We are the obsessed, the fan boys that the rest of society thinks is 'weird' and they are right. Hell, most of urban society doesn't even carry a knife anymore. And they make dinner using the 3.99 made in China kitchen knife from the utility isle at the supermarket because they don't care about knives. They use Bic pens, drive Toyota Corolla or Honda Civics, and get by just fine.