I was half joking about a new breed but at one time not all that long ago the GSD came about as a new breed.
Taken from several different lines and I'll bet a lot of culling to arrive at a stable Jack of all Trades, good with kids and can settle in home dog.
Dogs that could work at numerous tasks and still settle.
Not a whole lot of them in the GSD population any more.
Part of the problem is that people don't have the heart for culling anymore. I know I couldn't do it. I think even rescues tend to go to far in trying to save all dogs. I know I want to save them all, but should we?