I don't. That sounds maximal, but not absurd, not "you must take EPO and get cyberquads" silly.
Elite performance is a funny thing, takes deep commitment to train and a competitive mental edge as well as best training methods. The mental side is not pure science - when you get up to the greats on a big race day, the story is all about their minds, not their VO2 maxes.
Genetics is a common excuse of people like me, who kinda sorta push it but never really totally commit. If I stuck to any one of the training plans I draw up, I'd be... and so on, and so on. Truth be told, unless you gin up an elite competitive mindset and get elite training, you'll never know.
Tell you what though: I look at the TRAT riders' performance and I see riders doing way more than I think they thought they had in 'em. If them, why not us?