-There would’ve been no one to create the curse. Rumple wouldn’t have taken the risk of Zelena taking his heart.
-Storybrooke would’ve never existed. The darlings would’ve carried out Pan’s orders to adopt henry. Pan would be living, immortal. Henry would be dead.
Then again Zelena wants to change the moment Cora gave her up. Cora may have not become royalty. Queen Eva would be alive and Snow would’ve grown up with a happy family. She and Charming would’ve raised Emma. Pan would’ve had to manipulate things for Emma to meet Bae to have Henry to take that heart. He would’ve had to find another way to have Emma leave the enchanted forest to find Neal. Henry would be dead.