Throwaway account as I work there, but I'd like to make some minor corrections to this: I don't think most of Intel ever switched to hotdesking. It was a trial program. In my building it was on one or two floors. I can't speak for all the locations, but most of the other buildings at our site did not have this at all. Unfortunately I was on that floor and hotdesked for 2 years.
I'm pretty sure none of the process/fab folks were hotdesked (I used to work in that area and stayed in touch with those folks). Nor did any of the circuit designers/architecture folks get hotdesked. After a few years, the trial was over and everyone reverted back to having their own permanent desk.
It's incredibly unlikely that this is a reason for Intel's decline.