

Mobile non-Android Linux on more than developer devices and 5 year old tech would be the largest impact, especially if you could pull off half of what the Liberux Nexx was promising. An all in one convergent pro-privacy device with flagship hardware would be a game changer. Possibly more urgent now that Google is pushing Android to be more locked down.
Desktops are primarily used by hobbyists (mostly gaming), creators, and businesses. To get Linux more there you need OEM installs and more driver support, Adobe and other big holdouts finally porting their stuff, and alternatives to AD respectively.
Crazy how well *nix did back in '05, now that there are so many quality of life improvements, the near takeover of the web platform for most apps, M365 existing, Wine compatibility improvements, and the ease of management for virtuals & rdp/vnc when something must be on Windows, most of their concerns have hopefully been eliminated.
It’d be interesting to see if there have been recent followups.