This proposal simply trades one insecure, binary blob for another. It doesn't really solve the problem.
> rather than getting and updating 2-3 different insecure plugins all the time for doing the same thing?
IIRC each site can provide its own module, so it'll be many more than 2-3 plugins
> Is this just a crusade agains DRM as a whole (good luck with that) from the free software movement, or do they have problems with this exact proposal from the w3c?
Why good luck with that? DRM simply makes honest users jump through hoops and allow themselves to be controlled. Also, the proposal itself doesn't really solve any of the problems that flash and silverlight do. And those binary blobs will still probably not run in linux...