If they're so well suited for enduro racing as you say, a format where equipment is continually pushed to the absolute maximum, why wouldn't they be good in local road race or crit? If they are slow to sell, why is every manufacturer from A to Z introducing disk brakes to their cx and road bikes?
Keep in mind this thread has nothing to do with disk brakes, I would suggest you either create a new one to continue the conversation, or jump in on a existing one. You know 42x16ss we've beaten this subject to death over the years here on the forum and look at the market since then, "slow to sell"? C'mon dude, you wouldn't make a very good lawyer. Are we looking at the same industry?