If anything, this is the reason Linux could hit that point. Desktops are increasingly for specialized applications: gaming, development, content production, etc

If anything, this is the reason Linux could hit that point. Desktops are increasingly for specialized applications: gaming, development, content production, etc. If you just need general consumption, you probably have a tablet or phone. I could absolutely see Linux hitting 5% just because people who would never use Linux have stopped using a computer at all.