Bob, not trying to argue with you, but I dont see how you can empatically say a CT will fail you in an emergency situation. If you havent ridden on one, how can you state that? Have you seen any postings or stats that blame a CT (on any kind of bike) for letting someone down in an emergency manuever? I've ridden many miles on a CT, and can state that on the VTX, it never failed me in any situation, nor given me any, repeat any, concerns that it would. In fact, I had more confidence in the CT in emgergency situations than the MT.
Not trying to argue with you, just sayin' ....
Now I will say that IMHO the jury is still out as far as a CT on the ST. This is the first time I've heard it being done (much to my delight), so there is still a lot to learn - what tire brands, ratings, etc are avaiable in our size, how does each perform, ride, traction, etc. There is a wealth of knowledge in this area on the cruiser and wing and valk forums, cause they've been doing this for many years. We (the ST community) are coming to this rather late it seems, and IMO still have a lot to learn. This is a very key point, we may not have as much success as others running a CT primarily due to the choices available. But that doesnt necessarily mean it's a bad idea.
The ST may not be as good a candidate for a CT as a Wing or a VTX or other similar models, for obvious reasons. It might be possible to put a CT on an ST, and it might work for some. But just as there are differences in ride and traction in MT, the same is true in CT in this given application. Given the slim CT choices for the ST, it may not be possible to put a similar quality tire onto an ST that one would be able to put onto a Wing or a VTX. If the only CT tire choices that will fit an ST are lower quality tires that dont offer the same ride, traction, ratings, etc as say a GYTT or Toyo or other name brand tire that fits the Wing, VTX, etc, then I'm not sure I would go that route. CT availability in a size that fits the ST is one reason I havent done it yet. If I find one I like, you can bet your sweet bippie I'm gonna try it!!! Cause I've been a Dark Sider, and not afraid to admit it.
Now as far as why tire manufactures havent done it yet, to me the MC tire is a tremendous compromise. Think about it. The bike mfgr has certain design spec/criteria to try and achieve, to appeal to a certain market. E.g sport bikes need good traction, quick turn in, high lean angle, high speed rating, etc. The tire mfgr has to design a tire to these specs set by the bike mfgr, and still make money on replacement tires and make a safe tire. I fully expect those that put on a lot of miles yearly make up a small minority of the overall MC community. Therefore I expect there isnt a real incentive for the MC tire mfgrs to make a tire with long tread life. This takes a lot of $$ in R&D, testing, etc. If the customer base isnt there, why should the tire mfgrs waste their $$$ and resources? Dunlop with their RoadSmart tires seems to be one making an attempt, but it seems they're having mixed results. I know a LOT of factors go into tread life, but if a CT mfgr can make an 80K mile tire, it seems a MC tire mfgr can make at least a 15k mile tire.
But it goes back to product demand and profitability.
You wont see a CT on a moto gp bike because they have exacting criteria that are not needed on the public streets (smooth transitions side to side, superb traction, quick turn in, etc, etc). IOW, most of us dont worry about high siding at 100+. And as far as tire life, all they need is for the tire to last to the end of the race (tire management is often crucial to winning). We poor working souls on the other hand, need to squeak out as many miles as we can. If that means putting up with some minor compromises, then many of us are willing to do it.
With more and more riders putting CTs on for varying reasons (for whatever reason - increased traction, increased tire life, better ride, safer, etc), I would hope the tire mfgrs will start noticing and make changes to MC tires to improve their tires.
Sorry for the length of the post, just had to express some of my thoughts.