I don't understand your point. What does maturity have to do with "the right mindset to steer something as pliable as a web app into a product that keeps up with the non-stop competition for users' attention?"
My point was the product is geared towards the immature, and his being immature for so many years gives him an advantage in understanding both the product and his target audience. Yes you could train a mature person to think like a college kid, and maybe they could even hearken back to their college days for reference, but the times they are a-changin' and what's been considered cool for the past decade won't be next decade. Thus my point was: will Zuck be able to keep up with what's cool as he gets old and out of touch? My opinion is that being mature is actually a detriment here.
