I think Rumple has a lifetime of redeeming to do. I don’t know if he’ll ever be done, but I want to see him try.
Second, Hook will still want his revenge when he finds out what happened. That puts anyone who comes between him and Rumple in danger, especially Belle, and we know how Rumple reacts when the people he sees as “his” are threatened. It’s not easy for him to make good choices, especially when his emotions and fears are involved.
I am very interested to see how Hook will respond to the killing of Cora. He and Cora had a very shaky alliance and now that Rumple is fully healed and immortal once more, will Hook go after Bae? Or Henry?
And he liked Henry before he connected him completely to the prophecy, which thoroughly complicates that relationship; I don’t think he wants to hurt Henry at all, even family matters aside, but he might if he thought it came down to him vs Henry, or even Belle/Bae vs Henry.
After that gut wrenching moment with Bae, I don’t think Rumple will go within five feet of hurting Henry. Henry is off limits to the Dark One right now because Bae and Rumple had this wonderful moment and to heck if Rumple will make the same mistake twice.