Are you implying that there isn't any game-changing areas of an OS anymore?

What about the WIMP (windows, icons, menus, pointer) interface?

What about cloud computing (as stated in the article)?

What about the future of the internet (call it web 3.0 or whatever)?

Looking at the timeline of operating systems and "game changing" improvements, I would imagine that it will continue to grow exponentially as it has been for the last ~30 years. Microsoft, Apple and Linux all have a great chance in contributing to these advances.