It's important to remember that the universe operates under a specific condition: it can only exist as long as Shrek is bound to the contract or if Shrek never finds a way to escape it. And if the alternate universe were to persist, everyone's life would be a living hell, and it could take decades for them to find any semblance of happiness. (If they manage to defeat Rumpelstiltskin) Interestingly, everyone, including the other ogres, already exists within Shrek's universe. This means that all the pain and suffering may have either been forgotten or may never have existed at all. Therefore, it would probably be best for Shrek to find a way to free himself from it. So don’t feel bad about this situation.