The handwringing over this strikes me as extreme. Mozilla already ships with the ability for users to enable closed-source, proprietary DRM schemes to view web content -- the Flash and Silverlight plugins. Moving from the current regime of Flash/Silverlight to the EME is a move towards openness, not away from it -- the DRM scheme is still closed, but the content itself is more open and standard than before, as you're no longer tying yourself to Flash's implementation of video streaming.