Not on road race bikes, I think, because they will always be heavy and road race brakes already work well enough. There is also a slight additional hassle in doing fast wheel changes with disc brakes, so pro road teams won't want them.
Rim wear is a genuine issue for all weather bikes, so discs will become pretty much ubiquitous on utility bikes, which includes touring and commuter bikes with drop bars. Since cyclocross gear already crosses over into the spring classics, it won't be a surprise if somebody uses discs in P-R on their "wet conditions" option bike, assuming the UCI change the rules to allow it. At the moment, only CX bikes under UCI rules can have discs.
Not on road race bikes, I think, because they will always be heavy and road race brakes already work well enough. There is also a slight additional hassle in doing fast wheel changes with disc brakes, so pro road teams won't want them.
Rim wear is a genuine issue for all weather bikes, so discs will become pretty much ubiquitous on utility bikes, which includes touring and commuter bikes with drop bars. Since cyclocross gear already crosses over into the spring classics, it won't be a surprise if somebody uses discs in P-R on their "wet conditions" option bike, assuming the UCI change the rules to allow it. At the moment, only CX bikes under UCI rules can have discs.