I love the idea of road disc. I set up my rain bike with them, and they are GREAT.
I am a mechanic of about 2 years now, and I know that one negative of the bike industry is Dogma. MANY people rip on new ideas without any knowledge or experience with the the technology.
Pro's: STOPPING POWER in any weather, no rim wear, last longer in bad weather, (all of which really help here in seattle.).
Cons: Weight, price(IF CONVERTING, not soo bad if using initially), Compatibility issues.
However; compatibility is a bad reason to avoid a good idea. Like BB30, which people still reject because of compatibility/specialty, but is catching on FAST. Road disc is catching on.