Chris Froome bores me. His racing style is boring and his opinions I could care less about. I am sure as person he is just fine but marginal gains make me yawn. Disc brakes are just fine and if you are having issues you are probably doing something wrong. He has mechanics so he should be having issues unless using crap equipment but why would he do that. I haven't used SwissStop rotors but their pads are excellent so I doubt it would be that but maybe that is the problem or he has a really flexy frame that is causing issues which seems suspect. If his issue is over heating a larger rotor would help or learning how to brake better.
Ehhh...he might just want to start another debate on disc vs rim brakes because he was stalking the forum and realized we hadn't had one in while