Where do you get these numbers ? At work, I do not know where the servers are physically located (some VMware ESX in a closet). Most of my colleagues are in the same situation. Even for windows, many people use terminal services for teleworking. At my previous job in Belgium, it was similar (with a different X server).
I have provided support to Nederlands and Portugal using X11VNC.
Outside work, my wife and my mother are using linux. They call me when they have an issue. Hopefully, I can help them remotely 99% of the time.
IMHO, local desktop is the exception in entreprises.
The lack of a reliable UI is one of the main reasons holding me back from using Ubuntu as my main OS. I wouldn’t mind giving up a native Remote Desktop if it means everything else works better.