Good catch. They were all off the top of my head based on a lifetime of studying the game industry but not having the time to dig out citations for everything.

Good catch. They were all off the top of my head based on a lifetime of studying the game industry but not having the time to dig out citations for everything. They're mostly google-able, a few GDC "year in numbers" slides can show you the trends you're interested in. I'm probably off by a few years here and there. It was all just to illustrate the point that things are changing fast and not stopping, which I'm confident will stand.