The other one can be written off the same with Snowing does. Snowing, Belle, Emma, etc can all be swept on a curse that takes them to the EF.
I think we’ll know whose dying if we look at the PR for the finale and it’s centered around somebody. If it’s Rumple, then it’s him. If it’s Emma, it’s her.
In my opinion only good things can come from Rumple’s death. Nothing but horrible things can come from Emma(the hope) dying.