That seems a touch excessive, though, don't you think? Now I agree if it becomes a yearly thing. If the same pair is throwing eyeless, kinked, or otherwise "grossly" deformed babies every season then they should never be paired together again. If one of that pair keeps throwing deformed babies with other snakes, then that snake should be retired from breeding. I'd go so far as to say the retired snake should never be sold; it becomes the breeder's responsibility to keep that snake from ever having the chance of reproducing again.
Culling an entire line because of one deformed baby doesn't make sense to me. That one baby lost the genetic lottery and happened to get a mash of poor genes, or a complication in the egg, and so ended up with a bad spine (or whatever else). If the parents and all other siblings are healthy then it's obviously not a dominant defect getting thrown around.