One of the unforeseen effects of the Internet is that it allows small subcultures to congregate. This creates the illusion within those subcultures that the subcultures themselves are larger than they really are. I think that the number of people carrying knives at all has diminished, and that within the small percentage of the population that does carry a knife the percentage that carries a traditional knife is equally small. I have yet to stumble upon another person in the real world that collects any kind of knife, much less a traditional knife.* The people I know that carry a knife all do so without much thought as to what knife they're carrying and look at me sideways when I indicate that I have an interest in knives.
About six months ago we had a discussion which led me to do a very little bit of research into how many knives various companies were producing. I was blown away when I saw the difference in production numbers between the companies making traditionals vs. the companies making modern folders. If traditionals are becoming more popular the numbers are so skewed that the increases become insignificant.
As has been mentioned above, everything in this post is anecdotal and I have no hard facts. It is very possible that I'm completely wrong about all of this, but the OP asked for our impressions and these are mine.
* I have met other people that collect knives, but only after seeking those people out. I've been to knife shows and people that know I collect knives will give me tips on stores that they find with large knife displays. When I go to these locations I sometimes run into other knuts.