I think the definition of a “casual user” has changed drastically over the last 10 years.

This very much used to be true. But most gamers (i.e. the group we’re talking about here) are more than technically savvy enough to run Linux. Most gamers have seen a terminal once or twice and know how to google the solution to common fixes.

And yes, I do believe most motivated users (those unhappy with windows) can install Linux. It’s SO easy these days requiring nothing more than a USB and an hour or two of time.