I disagree with you, genetics does play a part in the temperment of the puppies you're going to get and within GSP's know several breeders that have voluntarily removed dogs from the breeding pool that physically have fantastic conformation, but are lacking in some way in the temperment area.
We do have too many breeders. I've seen it in the dog show world; there are those that have almost a hoarding personality, and then there are those that I believe think along the lines "just this next litter and I'm going to have the next Westminster winner!" It has become a hobby of mine and my hope is to keep the pick bitch from the litter and continue the line with her. When "vetting" people for purchase of puppies I take into account, among other things, if the dog is going to be just a pet, if the owner is interested in getting involved in showing, agility, hunting, tracking, etc. as GSP's are a very versatile breed. I'm considering asking to see their long form birth certificate as well. ;)
Glad we both want the same thing in the end, good dogs in good homes.