I think the only thing that can hold up HTML5 - like other web standards - is IE. But as others have noted, IE has tiny market share on mobile devices, and, I s

I think the only thing that can hold up HTML5 - like other web standards - is IE. But as others have noted, IE has tiny market share on mobile devices, and, I suspect, less among young people than old. So here is a winning scenario: mobile web use continues to grow. Sites that target young demographics use HTML5, and their core users are fine with it. As they grow in popularity, IE is forced to support the standard as it becomes obvious that it's "that sucky browser" if it doesn't.