To me, a "traditional" is a pattern of slipjoint, or friction folder, with no daRn pocket clips, no one hand opening holes/thumbstuds/thumb bars, locking blades, etc. with multipul blades in many the cases of the slipjoints, depending on the pattern.
BTW, any company can make a pattern, and not be accused of "copying" or faking a knife made by someone else
As for the "modern" single blade one hand opening flipper or whatever, with frame or post 1980's "tactical" liner lock design ever becoming "traditional" to later generatons ... I m not sure if "traditional" is the proper terminology. They may well become/have become "a knife like daddy or grand daddy carries"
(In not to many more years "like great grand daddy carried". Those of us born in the 50's are old enough now to be great grand parents now. I'm sure some from my generaton who carry a "modern" knife. Those born in the '70's and started carrying the then new "modern"/"tactical" one hand opening liner and frame lock blade knives in the '80's are old enough now to be parents and grand parents.)
Are any of the modern knives a pattern that anyone can make, or are they all a patented propritary design that no one else can make until (a) the patent expires or (b) They pay a royalty or licensing fee to the patent holder?
Personally, I think there will always be a market for the versitility of a multi blade slipjoint, by people who realize no one blade type/profile is "ideal" for all tasks, and carrying a single (or pair) of knives with two or more blades in the bottom of their pocket is a lot easier (to say nothing of more discrete) than carrying two or more single blade knives.
Also, a small/medium multi blade slipjoint, or a friction folder like an Opinel (with or without a lock ring, Opinel is a friction folder. They don't depend on a spring or detent to keep the blade open or closed. Use of the ring lock is optional, and the ring lock can be removed without affecting the useabilty/function of the knife) or MAM (without a linerlock), is less likely to be confused with/mistaken for a "weapon"
