"You can guarantee this won't be reciprocal. No chance that MS will want PCs running Chrome OS."
MS don't have any sway on what goes onto a PC other than OEM deals about what's on there when you buy it. The big problem with getting ChromeOS onto random H/W is that, at least last time I looked, builds of ChromeOS were H/W specific and if you wanted it for something other than a standard Chromebook product you had to build it yourself, always assuming you could get the requisite drivers.
MS aren't in the frame for this one. Unless Google have a change of heart it's always going to be easier to put a standard Linux or BSD on your PC than ChromeOS.
Biting the hand that feeds IT
