[ZeroGravitas]

Doesn't seem to address the elephant in the room: that Apple, Nokia and Microsoft rejected Theora as a lowest common denominator fallback codec, and failed in their efforts to convince the relevant patent-holders to make Baseline H.264 available for use on the web and now are stonewalling WebM just because it doesn't suit their business interests.

I'm fairly certain the other stuff would have fallen into place if a codec was widely supported.

edit: actually I suppose this is covered by "browsers failed to support WebM as well as they support GIF." but it's confusingly worded since Microsoft and Apple basically don't support WebM at all, and the widespread usage that leads to a better interface (in the browser and in forum software) depends on that.