It's natural investments may turn out wrong. Especially when expectations are larger than the potential, which is what happens..
He can do whatever he wants with his free time. I don't care. But telling everyone that is pointless if you don't solve a computer science problem, he is really illusionating himself. And raising his recomendation engine as the ultimate computer science problem is really ridicilus.
I will put it this way:
It was said during the International Symposium in Computer Architecture this year, although, i'd be mistaken who said it. I think it was put something like this to the crowd:
"We asked teenagers to tell us what is the most significant discovery. Their answer? YouTube That's what happened, we've gone so far with technology that we neglected what is important to the people."