you can logic all you want. the fact is, content providers want certain implementations of DRM. if "web standards" do not allow for these implementations, then they won't use those standards. you're not going to convince content providers not to have DRM just because its not a web standard - content providers never cared about web standards to begin with.

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?