The sad thing is that there's an easy way to save weight on wiring. It's called moving to a higher voltage. Audi is already unafraid to make your battery expensive. A simple regulator provides 12V power to systems that require it, and moving literally all of the lighting to LED solves the lamp availability problem and is long overdue in any case, on any vehicle where it is not present.
Another way would be to distribute networked controllers more throughout the car. This just doesn't have to be expensive any more. It does complicate repairs, but Audi is unafraid to complicate repairs, as well.