hello ...
i don't welcome this idea, i'm not a kid & can afford my entertainment & i'm a really big fan of Blizzard minus the Activision part.
this idea could work ONLY if people would buy it (the idea i mean here)... if they plan to add more content & make it a whole movie, then we will have rare games based movies that are really great for once, yet if we already purchase a game with same or 'almost' same content, it will be hard to put some more money in it & even for more than normal DVD/Blu-ray price.
I would consider VOD services, will cost less to produce & give even those who doesn't own the game the possibility to have a go, while i meet most of those who said would be great 'free' addon to those who paid the games (pre-order bonus - why not!) ...
but in the end, whether Mr Sir Senior kotick is right or wrong, it will depend on the us, the customers to show this when such products are released, if you don't like the idea ... just don't buy!
cheers!