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The teams, mechanics and riders never seem to have wanted them, it was more something foisted on them from above
The teams aren't made to use discs, they are simply allowed to use them in races during this trial period.
If none of the teams wanted them, you'd not see them. Since you're seeing them, some teams clearly do want to test discs.
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By from above I mean sponsors, specifically the bike companies supplying the kit. They want pro-riders so they can sell the systems off the back of them. If the teams wanted them they'd all be using them. I mean look how tech-savvy Sky is, with all their marginal gains, secret squirrel bollocks. If they thought using disc brakes was advantageous they'd be all over them.
I think both issues should be viewed separately, I don't see how one affects the other. It always felt to me that disc brakes were superfluous to pro-cycling. The teams, mechanics and riders never seem to have wanted them, it was more something foisted on them from above. If something was likely to give a performance advantage the teams would be quick to jump on them, but correct me if I'm wrong no World Tour teams have used them, only pro-conti and no doubt mainly at the behest of the sponsors.
Motorbikes are a completely separate matter, and a more complex ones as the UCI have to work with the race organisers to do something about and establish a set of regulations. Disc brakes is something they could move on fast and simply suspend them and remove any additional risk. I don't get why this is a contentious issue, no-one was really using them, they made it difficult for the neutral service cars and mechanics and the riders don't seem to want them either. Round peg square hole comes to mind l.