People who play a lot of computer games tend to eighter bore themself and move to different occupations or branch into game testing, game journalism, game translation and ultimately game development.
But yes, if all what 90% people want is playing computer games, that's what they should do. I just think you're off by an order of magnitude.
The only reason people enjoy things other than computer games is because computer games aren't yet good enough.
An environment created especially for the purpose of making us happy has an inherent advantage over reality. (Btw, don't forget the fact that our creative desires can also be realized in computer games.)
But yes, if all what 90% people want is playing computer games, that's what they should do. I just think you're off by an order of magnitude.