Well, I think very possible to have a 10 lbs bike that can take 200 lbs on it, it's just a matter of how much anyone no matter how rich is willing to pay for one or two pounds less.
Boeing uses a absoloute cutting edge carbon fiber material for aircraft fins; This material is so tough that one strand, YES JUST ONE STRAND of it that is only a few milimeters in thickness can be used to lift 300 people with an average weight of 60 kg.
I'm not sure if the caron fiber bikes we see for thousands of dollars use the same grade of material as that cause they are still prone to cracking, juts like they don't use spacecraft grade titanium in mountain bikes.