http://www.bbc.co.uk/news/magazine-12140064
The article is called 'Is there a genius in all of us?'
The most relevant bits:
"The same dynamic applies to talent. This explains why today's top runners, swimmers, bicyclists, chess players, violinists and on and on, are so much more skilful than in previous generations. All of these abilities are dependent on a slow, incremental process which various micro-cultures have figured out how to improve. Until recently, the nature of this improvement was merely intuitive and all but invisible to scientists and other observers."
"Our abilities are not set in genetic stone. They are soft and sculptable, far into adulthood. With humility, with hope, and with extraordinary determination, greatness is something to which any kid - of any age - can aspire."
So if the genetic predisposition exists to play great chess, it seems it can be brought out in adulthood as well. Maybe there is hope after all, though not for everyone!