Just to balance this out a bit... the alternate reality of "everyone tried" is kind of fictional, because a huge factor in high performers of their chosen sport/field/art is determination, resilience, imagination, visualisation, their psychology and finally personal desires - which are a product of their life experience combined with physiological predispositions.

In other words, what made Usain Bolt a gold medal winner wasn't merely physical potential and chance, but the mental ability to push his body to extremes and work at it every single day because he desired it that much and had the mental stamina to do so. In the "what if" reality, you would have to change everyone's mind to have the same psychology. You can have all the physical attributes and potential of a runner, but if you hate running and generally don't have much "grit", you aren't going to get far.