Do you think the Peloton should adopt disc brakes in their current form ? If so do you think the safety concerns (rotors, mixed brakes in the Peloton) aren't valid ?
What form do you suggest they take? There's absolutely nothing wrong with them in their current form and the safety concerns are easily addressed by making disc covers mandatory.
They feared they would unclip when sprinting.
But @hippy is right, professional cyclists are a bunch of conservative luddites who only change stuff because their sponsors make them.