There have been a number of disc brake threads on the road forum. They are always full of anti-disc emotion, dogma, and expert commentary.
I've not owned a disc braked road bike but there have been many times when rim brakes seemed inadequate. I'm over 200 pounds and there are some steep, twisty descents (Westlake Blvd, Balcom Cyn, Deer Creek) where I would like a little more.
Also, I've done mountain riding in the rain when my rim brakes were so bad I had to drag them constantly to try and keep some stopping power. Of course, the thick, black aluminum slurry gets all over everything, including the rider.

Let's not forget that road discs are still in early developement, they may get lighter, stronger, better as time goes on.
We should try to keep an open mind, remember how funky early mtb suspension systems were?
Remember how awful some early Campagnolo rim brakes were?