Essentially none of the organizations you've mentioned care about desktop Linux. They may care about the kernel, and many of them do help fund aspects of kernel development. But desktops? It's not relevant to them, or their plans.
You're mostly right, but most government orgs care about desktops, Intel/AMD care about desktops, IBM should care about desktops if they could get a foot in the door.
Amazon should be interested in providing a great remote desktop solution. IMO that is a huge untapped market, especially in BYOD orgs: sure, bring your crap device, but you RDP in for anything you need business-wise that needs to be secure.
