My $0.02
I have disc brakes on my new mountain bike and absolutely love them. The control and stopping power are beyond compare.
However, where I ride and how I ride, I don't see the benefit of discs on my road bike. I live is South Jersey; it's so flat we call the wind "South Jersey hills". It's not as flat as some areas of the Midwest, but there are no major climbs that require exceptional stopping power. I almost never ride in the rain, and I don't ride carbon rims. So I don't see what I would gain by switching to discs. I've never had an issue stopping my road bike with my rim brakes; if you do, you might need some training on the proper way to brake (I teach it in my bike safety class). Again, not saying there isn't benefit for some riders, just saying they don't justify the additional complexity and weight for others. If I'm missing something, let me know.