Possibilities for Revelations Easter Egg

I know that this subreddit is already full Revelations related theories and such, but there was just one idea that crossed my mind.

Now, when you did the Mob of the Dead and Origins Easter Eggs your game would end, this was done because it fitted storywise. Mob of the Dead even offered multiple endings, good and bad endings (and also a normal ending and a Samantha song ending, but that's not the focus right now). So, what I was thinking is that Revelations might end the game after finishing the main Easter Egg, because you, presumably, restored the Universe and there would be no zombies to kill, so no there would not be anything left to do.

But wouldn't it be cool if there were multiple endings again; A good ending that ends the game, or a bad ending that results into the universe still being broken and you could just keep on playing.

So the choice would be that you could finish the game and have a good conclusion or you could continue playing with a few extra thingies such as permanent perks or whatever.