Yogi Berra would love how this topic has evolved. We see the same things, we just look at them differently.
I hope my next main cow herd is better than the current one. I don't want to turn my cow herd over every 3 years, I just want the next "group" to be ready to go and in their prime when the previous generation is done. The replacement process is gradual for me, a few at a time. As far as the term "best", each breeder should have an ideal in mind. If you think you're there, you're not. There's always room for improvement.
I agree that we need to specialize. I tried to get that across ealier. However, I don't mean as a total breed. That would be impossible, unless we got a government grant. Every breeder specializes according to what they like, what they can market, their environment, there are more factors than we could possiby list. Breed-wide specialization would lead to the elimination of too many genetics that will eventually be necessary. Where would we be if everyone would have been forced to raise the belt buckle, horned cattle of the 60's? Leader 21 would never have happened. Where would we be if everyone was forced to raise the Irish cattle of the 70's? How about the dual purpose? Or maybe the Maine influence of the 80s? Heaven forbid that we all have to raise what those crazy Canadiens do. (Grant, I still like your bull!) We need a diversified gene pool, probably even bigger than we have. Each and every breed of every kind of livestock needs just as a diverse group of breeders as they do animals.