Scottsman,
I'm gonna come at it from a little different angle - taking nothing away from what the folks posted above..
I think there are 'limits' - both from an individual talent perspective, as well as a time (or maybe better said, a 'choice') perspective. The time element is more of what I view as a factor in most peoples lives - Earning a living, family time, cutting the grass, picking the weeds

... But I guess you
could ask - 'If everyone had endless time to practice (and practiced endlessly), and directed all of their energy towards becoming an expert at the game of golf, would everyone's game rise to the level of the best players in the world? (choose your golf hero here)..
I just don't believe everyone's game would. I think some portion would - those with the inherent ability of hitting a golf ball extremely well - again and again, and have the amazing touch around the greens to turn two shots into one.. I guess I just believe that some folks are going to be better at some things than others - It's what makes the world go-'round!!
I could be wrong... Interesting question. I predict you'll get down to a 4!!
Swami Jim