I have noted that the new html5 can play video, but a video file like an mov, mp4 is not a load of assets loaded with js, it's a single container secure from anyone opening it in the same way as a js for a game to look at the code.
Therefore, if html5 still needs to launch a single container file for video, why not html5 launch a single file format like swf with all assets including the code for a game? Better still, games and videos. If they could make sure html5 loads in their file format for video rather than mp4, mov then they can secure Flash?
To play video in Firefox, don't you need to install an addon to play video anyway?
So, html5 is just replacing the download of one thing with another. The download of video codec instead of flash plugin?