Making a Becker folder is probably a little more challenging than one may think.
It's easy to make a cheap folder of poor quality; there is no shortage of them.
While it may not be easy, it is far from impossible to make a high quality folder at a premium price point; they're not too difficult to find.
A folder can be made to be very rugged, durable and dependable if the target market for that knife appreciates the value of these qualities and is willing to pay accordingly - not only in price but in weight and bulk. Striking a balance of these oftentimes competing design criteria, at a style and price that will sell, is something that entertains spectators of the folder market/industry - and makes BF a popular handout place for us Knife Knuts.
I would suspect that of Ethan were to put his name on a folder that his design inputs would not be too far afield from what we see in his fixed blade knives: rugged, durable, comfortable for prolonged use and value packed considering the foregoing. One may chop wood, prepare food, skin & quarter, carve, whittle or judiciously baton for a half hour or more with a fixed blade knife; I would choose a Becker for those sessions. Folders don't seem to see the prolonged use, per event, that fixed blades see. If I'm doing food prep at camp for a while, out comes my BK-5. If processing wood for a fire, the BK-9 (or maybe the 4) will be in my hand. Skinning a deer? Where's my beloved BK-15? Disemboweling a Buick? Got a BK-3? While I very well may have a folder on me during these events, it would not be my go-to choice if a fixed blade was nearby.
Back to folders. Like most of you here, I always have a folder on me - except of course in a courthouse or some other restricted or controlled area. If a knife chore presents itself I use my folder and put it back in my pocket. To open a package, cut a cord, peel a peach, separate a sandwich or bifurcate a bagel are the favored feats for many a folder. Speaking for myself, the folder is a tool of opportunity contra to a fixed blade which is planned for and possessed either for a dedicated task or anticipated task (i.e. hunting knife) where they are more comfortable, more durable, more useful and thereby preferred.
So, I said all of that to say this: Becker knives are comfortable for prolonged use, purpose built for dedicated (though also varied and versatile) tasks, rugged, reliable and affordable. Accommodating these characteristics, as I suspect Ethan would, in a folder is not as readily attainable as it is in the fixed blades we have come to know and love that bear his name.