the question is whether you care more about the adoption of the standard or the purity of that standard. if html5 doesn't include methods for DRM, then hulu and netflix will continue to use proprietary extensions. how much do you care about adoption? if only 50% of sites use it, is it still meaningfully a standard?
I assume this will be something that is available in Chrome and Safari but not Chromium and WebKit, etc.
Looking at the companies that control media today and trying to mold the environment of the web so that they survive is exactly backwards. Instead, I think the W3C should focus on creating the best environment for an open web possible, and let the companies that exist now adapt to it or be replaced by those who can.