If soccer were the number one sport in the US, not only would all the best athletes be going into soccer instead of football, basketball or baseball. The greatest minds and resources would also be going into soccer. We spend our mental and physical and athletic and wealth resources on other sports. If we focused them on soccer, we would be just like England, but with a much larger talent pool. We would dominate.
I guess I thought all of that was implied in my post. The best US athletes would not be going into soccer unless soccer was the number one sport in the US. I wasn't trying to suggest that we could just pull all our football players, and put them on a pitch, and they would outperform the world. I was just pointing out that the only reason the world has better soccer players is because they are focused on that sport, while we are focused on other sports.