Brake Disc Caliper problems of the 2012 Nissan Altima

Brake failure due to 4 seized brake calipers. My wife was unable to stop completely at a busy intersection entering oncoming traffic lanes. No cars were present or she would have been hit, but very scary for my wife. All four rotors showed only a thin stripe of pad contact down the middle of the rotor. Took car to dealership was told this was normal and not covered under the warranty due to corrosion of there calipers. Car had been in there repair shop 7 months earlier. Rotor deglazing was recommended but nothing was said about the brakes calipers seizing and brake failure. Deglazing of rotors would have been at my expense and I felt this was the dealerships responsibility if there was a safety issue. Being unaware of the severity of this "common" problem I elected to pass. Never did anybody state that this could lead to total brake failure and was anything but deglazing of the rotors, a dealer add on expense. Spoke to my local mechanic and he thought it was unnecessary. I had to replace all for rotors and pads, they cleaned up the calipers and said they should be fine. How will I know if they are fine or not? must I have brake failure again to find out they were wrong? I do not trust the brakes on this vehicle, they should not seize up on a 2 1/2 yr old car thats kept in a heated garage daily. They stated it was because of my location, upstate new york, and they could not guarantee the brakes system in such a harsh environment. I have never heard of brakes rusting and seizing before on any vehicle this new with such few miles. The manufacturer uses inferior materials to build its parts and its the consumers responsibility to be aware of this? I had no idea that there brake calipers seizing due to driving in the winter was a "common" safety issue. How can this be my responsibility to know that they have a problem with there braking system?.