Distributors may not be happy once they discover that Safari supports FairPlay DRM, Chrome supports Widevine DRM, IE supports WMDRM, Samsung phones support SamDRM, HTC phones couldn't afford to license any DRM, etc.
Yeah. Also, there's no requirement for the different DRM schemes to support the same codecs or containers or encryption schemes, so potentially they'll have to re-encode all their content for each scheme. It's actually less standardized than pay TV encryption believe it or not!
Edit: The interface between the DRM servers and your backend code isn't standardized either, so content providers still have to do a bunch of DRM-scheme-specific development work. Basically, they standardized just enough to allow sites with DRM to claim they're 100% HTML5, it barely improves interoperability at all.
