Being of the same train of thought as ramius (that's why I brought up this thread), I too believe that the balisong market will grow and will second the citation of the auto market. Legalities are an issue, yes, but look at how Buck knives "legalized" one handed folders and the Spydie hole. Thus, I find this to be a marginal concern, especially if such a hugely respected company like Spyderco were thinking of producing bali's. In addition, I'd like to mention another point ramius brought up: the tactical market is in a stage of growth. In a time where people like James Keating and Steve Tarani (not to mention Datu Kelly Worden) produce videos and books on knife-fighting, Keating bringing a renewed interest in Bowie methodology and Tarani showing how to use a kerambit (scary!), it is an eventuality that the balisong will experience a rebirth in popularity, especially amongst martial artists and collectors. I think, though, that the idea of a butterfly knife rebirth is also dependent upon a company's willingness to produce said knives for its customer base, especially if that base will guarantee its loyalty (reflected not only in intitial sales, but also in sales and trades after those models are discontinued). Look at Microtech, the apparent, or so I've heard, kings of the auto world. What market share do you think they cater to the greatest? The average Joe who needs to cut bails and open mail? Or the street ninja, the collector, or the few people who are truly tactical types (as opposed to the street ninjas)?
Additionally, martial arts in general have taken an upswing w/ the advent of instructional videos and sites like Clay's. These media make martial arts more accessible and more convenient to learn from. B/c of this, more people can be exposed to Mike Janich tossing balisongs around or Clay doing double manipulations. What's more, people see that SKILL is required when handling the 'song and what does skill bring? Confidence, and a little ego. But you can be only as confident in your skill as you are in your weapon. Hence, the need for a good quality bali. Frank, a fellow member, has told me that, w/ a simple handle flail, he bent one of his slabs upon impact w/ his desk (still have to see just how messed up your desk is, Frank). Would that happen w/ the BM 42? Now, I'm not saying that everyone should go out and buy the new BM bali, but, while cheapies are good for the rudimentary, and this is only an opinion derived from working w/ the stick and w/ nunchaku, I believe that the more advanced stuff should be left up to quality tools. See what I'm saying here?
Okay, so the logic goes like this: Spyderco should make balisongs b/c:
1) The tactical/MA market's growing and Spyderco already serves that market and
2) B/c media is allowing for the spread of interest in said MA's which leads to
3) A bunch of folks trying to develop their skills, but, finding inadequacies in their cheapies, move as a consumer force to lobby for a selection of higher quality balis, which, of course, leads to why Spyderco should make butterflies.