What, do you think, Operating Systems will look like in 10 years?

Pretty much the same. We plateaued with new features some time ago. OSes 10 years ago were almost the same as now. We got more indexing / relying on content rather than paths. We moved more apps to the browser. But fundamentally, you can't do anything on W10 that wasn't possible on XP.

There implementation will change - more "as a service" on both OS and app level. Disk will be more of a cache layer. (Than it already is)