It's very hard for a single distribution to represent "Linux." Better to perform a gaming test with an aggregate of distros that represent at the least top 80% of the distros most frequently used for gaming. Average each test result weighted by frequency of use to get representative "Linux" results.

Sony isn't getting rid of discs because of the limitations of the technology - otherwise, they would be R &D ing higher capacity blu-rays (or maybe something else). They're doing it because most gamers are now digital so don't want physical, and also because they want more control over selling games themselves. So, all of these suggestions for cartridges or whatever seem entirely to be missing the point.