[jpetso]

About 4-6% in US and other Western countries, depending on analytics source. Increases in the past year or so by a full percentage point or so. More in India, less in South America, barely any in China.

The increased visibility due to SteamOS/Proton, coverage by various prominent TechTubers, end of Windows 10 support, availability of image-based OS upgrades and Flatpak/Snap to supercede package dependencies, all seem to combine into an actual breakout year comparatively. We'll see if the trend holds or was just a one-off.

[pjmlp]

After 30 years, do the math of much years are left.

[jpetso]

Until monopoly, or until 15-20% when companies start offering widespread Linux support for applications and peripheral management, and retail stores start selling some devices with a Linux desktop preloaded?

I'd do the math, but it really depends on whether the recent growth holds, accelerates, or slows down again. So, hard to tell.