To me it doesn't make much sense to use carbon wheels, and then stick some contraption like a caliper and rotor on the side of the wheel negating the aerodynamic reason for using carbon rims in the first place. The scenario would be even worse with light weight climbing wheels.
And yes, putting aside the coolness of electronic shifting I don't see the point. I have used it. It was really neat how I pushing a button and my gears changed, as opposed to pushing a lever and having my gears change. I view road discs in much the same way. New and interesting, but what is the net gain?
Exactly... I'd even go a step further and say there is a net loss. But I'm glad you brought up the aero factor of disk brakes (I forgot in my post) because it totally smacks the manufacturers in the face now that they've been touting "aero" as the be all and end all of bike performance... "Lets go to great lengths to hide this 4mm cable from the wind, then let's slap some rotating disks on one side of the wheels, just for balance lol, and really cause an eggbeater effect of air down there... oh, but let's not mention that in any of the marketing hype we put out touting the benefits of disk brakes, ok?... Ok Boss, got it!"
And with electric shifting I lose feel and it seems slower and less predictable than mechanical shifting (set up right, of course). Tried it. Not impressed. Again, what's the gain.