Don't know if anyone else has thought about this.
Up until now the memory competitions has proven that this is something anyone can do if with the right technique and amount of work, but I think that it's just a matter of time before someone with extraordinary capabilities comes in.
As an example if anyone has seen Kim Peek, you would understand what I'm talking about. This man could read two pages at a time with ridiculous speed and comprehension. Would be interesting to know if his abilities could have been transferred to any of the memory disciplines.
Savantism on this level is quite rare. Another example could be someone with synesthesia coupling this with other memory techniques and making a supercharged system.
You can talk about "genetic advantages" in other sports as well, but in this field it would be really apparent.