Have you got any evidence for that, other than what your kids play?
Most of the people I know that play video games play a wide range, and I highly doubt that steam could have been a fraction as successful as it is if “95% of the people play one game exclusively”.
Most of the people I know that play video games play a wide range, and I highly doubt that steam could have been a fraction as successful as it is if “95% of the people play one game exclusively”.