yeah it is, but its a learning process.
i reckon your son should be about my age.
when he eventually grows tired of the game, he'll look back and
realize just how much he has been missing on by just facing the
screen the whole day.
and from then on, he'll be a casual gamer and no longer hardcore
like before.
only thing is whether, is he sacrificing too much now for that
learning curve?
for me, i sacrificed grades but still managed to pass and lotsa
sleep. 
