What games do you consider to _require_ a heavy investment of time? A Korean who was obsessed with Starcraft died after playing too long. Do you believe Blizzard is somehow responsible?
I do believe in general that people are responsible for the consequences they create even if they could not have possibly predicted them. I certainly don't think that Blizzard should be punished for the death of that man. I would only hope that when they heard the news that as individuals they stopped and spent a couple of quiet minutes asking themselves if what they are doing contributes to improving human society or not.
How many must die playing Starcraft waiting for Starcraft 2 to come out?
:) (I personally played something like 2000 games of it)