75-90% of road riders do not need disc brakes. It is all a marketing ploy. All the roadies I know do not go out in the rain. Why would they purchase a new bike with a system of brakes that puts 2-3 pounds on the bike and negatively affects its aero-dynamics, balance and wheel/tire/tube accessibility?
If you have rim brakes and you have problems stopping, I suggest you plan your rides better, buy better equipment and adjust/maintain/repair your brakes more often. There's really no excuse for not having reliable brakes. If you have disc brakes on your bike, chances are that you just got played by companies who needed to sell new bikes to people who already have bikes.