2017 BMW 328D Service Brakes Problems

I started to hear a grinding noise from the center-underside of my car about 4 months ago. I did some research and found that many BMW customers had experienced the same noise and the diagnosis was a parking brake line that drops on the main driveshaft after breaking free of the plastic support that is supposed to hold it in place. A video with sound of of the problem can been seen/heard here - [XXX] I had my BMW dealer look into the problem and his diagnosis was the same. The plastic clip that holds the parking brake cable in place had broken. And when the cable drops it rubs on the driveshaft making the grinding noise. A copy of the estimate to repair is attached. So far this failure has not caused any problems with either the parking or drivability of the car. The concern that I have is...