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For pros I reckon its a case of 'if it aint broke why fix it?'
I don't think it's that - Pros do adapt to new tech for marginal gains. 8/9/10/11 spd, clipless pedals, electronic groupsets, wider rims/tyres. If disc brakes came without two additional cutting edges added to the bike they'd be (slowly) all over them.
Ste_S-
Really? I took pros ages to switch to fatter tyres, most commuters got the jump on them. Lots of them still seem to think harder=better re: tyre pressure. Clipless - my post earlier mentioned King Kelly took 10 years to change to clipless - 10 years! Gear choice is down to manufacturers and mechanics, not the riders - of course they're all using the top end groupsets with 11spd - because you can't get DA9000 in 8/9/10. Aerodynamics - up until a few years ago most riders on the TT forum had a better knowledge of aero than most pros.
The difference with discs is there's perhaps not a clear advantage and some disadvantages for the pros. This runs against the advantages discs provide non-racers and that means bike companies and riders are likely to be in conflict about this for a while.
hippy
Lots of factors here.
Performance isnt everything. And this statement means different things to us plebs vs the pros.
For the plebs I'd say mmmmmmaybe blaming rim brakes is a user error.
For pros I reckon its a case of 'if it aint broke why fix it?'
Bottomline is most dont need disc brakes on road bikes; plebs and pros.
And there is still long way to go for them in terms of tech. In terms of design they are still an afterthought.
This on the other hand ..