Will there ever be a fighter who masters grappling and boxing?

i'm wondering if there will ever be a fighter who is, say, a combination of a prime roy jones jr. and a prime anderson silva in one package. maybe this will never happen. perhaps the time and natural skills needed to be a dominant world champion boxer as well as a dominant world champion mma is virtually impossible. i think anderson silva pulled out of a boxing match with jones because dana white knew he would not make it out of the first round against even a 39 year old jones. on the other hand, roy would likely have no answer for silva's grappling. there's probably just no way to be world cl at both.