Flash is partially disabled in Windows RT. There's a whitelist of sites that flash will work on which currently includes YouTube. The intention is that as sites on the whitelist move to HTML5 they will be removed from the list until the list becomes empty, at which point Microsoft will have in effect banned flash from Windows RT.
Also, unless you are claiming that the iPhone and iPad are not "useful", they are good counter examples of web surfing devices that don't have flash.
Not a very good example for me as I've never like iPhone/iPad. But I do agree you have a point there.
Btw, AFAIK there's still quite some jobs on job market that requires ActionScript skill. In other words, even when HTML5 become mainstream, I don't expect Flash to fade away within 3 years.