why doesn't the cycling industry reach out to the motorcycle industry for their expertise on this matter? motorcycles have been using discs since the late 60's. if anyone can solve these potential "problems", it would be a company like Brembo.
The expertise is already there - its in MTB disc brakes. The MTB guys have already sucked just about all the know-how you can imagine from the motorcycle guys, and have in fact pretty much dialed-in disc brakes for bicycle use.
The middle (and eventually, low end of the market when the tech trickles down) will eagerly adopt disc brakes for road use. The high end will resist, not so much for the weight penalty (we already see even hardcore racers willing to take a weight penalty for a powermeter, a comfy saddle, aero wheels, di2, etc) but because of the aero penalty.
Then again, if we start seeing more wind tunnel tests like the SD test that found that once you actually put a pedaling rider on a super aero bike, there is no drag difference between that and the same rider on a "barely aero" bike (the theory being that the legs spinning churn up so much air around the frame that aero frames don't do anything/do very little in real life use), then maybe people racers will decide that the aero penalty isn't real - and road discs will offer advantages in braking, lighter carbon rims, carbon clinchers that won't melt under hard braking, etc).
Then again, if that is the case, I will need to sell my S5 and manufacturers will have to tell us that we have been wasting our time and money on these new "aero" frames.
I think in the end though, adoption at the high end will be difficult due to the aero concerns.