I'm trying to understand what your point is? That selective breeding is pointless?
Would I guarantee that they're not going to brown out over 30 years time? Of course not. But at three and a half years old, Winston still gets gasps when people see him in person (at 2000 grams). He is starting to get a little brown on top, but his yellow still is stunning.
If I'm not going to selectively breed with the goal to produce nicer and nicer animals, then I'm not going to breed at all - what's the point? Just to produce animals with certain genes just because?