Bright argues that if HTML5 does not support DRM, then content providers will move their content away from open standards and implement it with native apps
Good, they can take their crap and stick it where I don't want it because if it's DRM'ed then I don't want it, so keep the DRM the hell away from my browser.
DRM is an insidious evil that does nothing but treat you like a thief, it stops all kinds of disability plugins from working, it stops your fair use rights, it breaks everything, you might find that because some driver doesn't work perfectly that you can't view content you paid for, or you may find that you can't legitimately copy something when you have the fair use right to. Even an action as simple as highlighting a couple of words and copying them to search about them may be removed. And the huge irony will be that this won't stop the pirates, it will only prevent paying users.
Sincerely, keep this out of HTML5, it just doesn't belong in a free web. If someone want's to write some proprietary thing to screw their customers then let them do that, but don't go forcing this stuff on everyone else so easily.