Our DS, whom I would describe as a video game afficionado, says there simply isn't time. Days, especially for freshman who, at most schools, have enforced study hours, lights-out, and internet shut-off times, are extremely busy and scheduled. DS says that sometimes the kids carve out a couple of hours on a Saturday to play group video games in the dorm, but that's about it. He's learned to live without gaming at school and looks forward to it at home.
Of course, he says, there are some kids who continue to play hard at the expense of school and are good at concealing what they are doing, but it can and does affect their performance. Kids make choices. It's all about balance. A bit of play time isn't going to hurt, but for those kids who are "addicted" to video games, the rigor of BS is going to force some withdrawal.