You don't have to like the Days Gone demo, but you should at least recognize that there a ton of people that eat that stuff up. Everybody in my theater really enjoyed it, and it's not really that far from the almost entirely scripted Uncharted setpiece that was deemed good enough to be a show closer before. It's quite possible that Sony just saw it as an acceptable way to end, and thought that the zombie horde numbers were impressive enough to wow some people.