I think there is a reason we have seen very few road bikes with disks. After all, all the parts exist. What I have heard is that the ride characteristics are not positive with a disk fork. The front disc generates vibrations that transfer through a light carbon fork that make for a frightening feeling stoping from speed. A heavy fork from say a tandem has less vibration when stopping but makes a horrible ride when on a single. The beefy fork also adds weight to the bike.