That's a polite way of saying it! A speedcubing method with move count below the FMC WR? Don't think so. The human brain needs 'stages' or 'steps' to break the cube down - any human method will inevitably be sub-obtimal. With Roux growing in popularity, I'd hope more time will be spent on it, and more variations developed. Maybe this, OLS and other CFOP developments, or, as Kong says, ZZ with ZBLL could give a method which averages possibly 40-45ish moves?!
Really????
I think you'll find that elective genetic procedures are illegal, and procedures of the type you're referring to are probably a generation away. There's little point speculating though - the purpose of this thread is to discuss the possible fastest speed that HUMANS are capable of, not computers, cyborgs, etc.!
So back on-topic, I'd say a method with a 40-45 move count is possible. 15TPS, on the other hand, probably isn't! 10-12 maybe, but not consistently.
I'd imagine we'll see an official sub-5 single in the next few years, and a sub-7 average. Realistically, I think sub-4 singles and sub-5 averages would be close to the limit of human potential.
Edit: sub-4 single using a method that averages 45 moves (possibly a lucky scramble - c.40-45 moves) = 10-11.25 TPS
sub-5 averages using a method that averages 45 moves = 9 TPS