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What would happen if you trained a kid how to play from a young age? Would he become world class or a junkie? Is it all genetics?
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Probably both.
A guy in Hungary did this with chess and his daughters. Two of them,
Judit Polgar and
Susan Polgar, became grandmasters--in fact, Judit is consistantly in the world's top 10--and the third,
Zsofia Polgar, became an international master (the first step below GM). Of course, you need a ton of practice to get that much success. If you trained a kid from an early age to be a poker player, I doubt he'd/she'd have a well-rounded personality.