Rob Pike on why Systems Software Research Is Irrelevant. The general theme is that true experimentation and novelty has died out in OS design, and why. Blaming Microsoft is a scapegoat; there are other factors discussed in detail*.
* As much detail as slides can provide. What could we do differently? Who knows? Here's an overview of Plan 9, Pike's OS from the 80s. I am sorry to write I know nothing about it, but I will read this now, but I understand it is "different" in some radical ways.