There IS a big chance that pizza sauce-chan de gozaru might come back at the end of the cour. It's KEY and Maeda after all!
My thoughts exactly, they could get a chance to redo things, they could all be dead, they could be in a artificial world. You can never be certain with Maeda and KEY stories. It's why I'm only watching snippets and will watch the whole thing near the end otherwise i'll spend all my time inbetween episodes trying to figure out the reality of that world. Heck for all we know the reality is they are all stuck in a mental assylum and this is the reality they created to escape their pain.
Its always wierd with KEY, on one side you know it's their creation, as they all share the same DNA yet you can't be sure how things will end. Where usually once you figure out a style you can predict the end, the only thing you can know here is that the world is not as it seems.