this camera thing won't help. i promise you this. It won't make bad drivers into good drivers. No amount of technology can accomplish that.
This may be partially true but I don't believe that "bad driver" is the only variable in this argument. It also has to do with the cars design. In my car (2014 BMW 428i) the rear window is tiny and does not afford much if any better view than the center rear view mirror does. The seats also don't permit turning around and looking out the rear window, it can be done but boy is it awkward.
The combination of the rear view camera, a front and rear ultrasonic parking distance control (with object detection) coupled with the use of the rear view mirrors make backing up quite safe and easy for this car .
All of the cars I've had prior to this one had none of this equipment. Now that I have used it I'd never buy a car without it. Kinda like heated front seats!
As to other arguments I've read (not in your post but others) about the increasing of technology in cars... Well that battle is long lost my friends. And it's not really about compensating for a lack of driving skill but rather more like life insurance, those system can and do save lives. But, as the owners manual states, no system can compensate of a lack of good judgement on the drivers part. These systems can however help you get maximum performance (like breaking and maneuvering) out your vehicle as long as you operate it within the laws of physics.
A bit of advise, if you can afford it, consider a extended warranty.