Klayley What Could Have Been

What if things from the show went a little differently then it was shown...
What if Klaus and Hayley, had actually ended up together instead of her and Elijah?
What could have happened when they were together almost from the very beginning... how would it have affected the other's relationships with them?
Could they manage to make being together work even after the years of separation and the time apart without falling apart?
What if something different happened and instead of hayley dying it could have been Klaus or even their daughter?
What could have happened if the story had changed and different choices were made.