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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.
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.