I know there are still a lot of Windows XP machines floating around out in the business world and some in the personal world, I can't imagine XP users holding back the universal usage of HTML5 very much longer. If you asked me that a year ago I probably would have agreed, but within the past year myself and my other colleagues in this area upgraded most (I only have one left) of the computers to Windows 7; that's just business. I upgraded a lot of friends and families' computers to 7 this past year too, which was a shock to me. I know this is only my personal experience, so it would be ignorant of me to project my experience to the rest of the world so I won't go there, but I do think it's honest and fair to say that XP is dying sooner than we expected and there will only be a small percentage of XP users in the coming years.
Note: I do have personal friends who still run 98 machines, so I'm not unaware of the folks who like their old OSs.

































