My experience recently is with Lovefilm, where they switched to silverlight delivery of content citing "anti-piracy measures" [1]. If we want to move to a www with HTML5 only video, an addition to the standard is required.
Whilst there will no doubt be people opposing any copy protection, I'm sure many can cite examples where it's exclusion is hampering the web.
[1] - http://blog.lovefilm.com/uncategorized/why-were-switching-fr...