Board Thread:General Discussion/@comment-25733960-20151004174351/@comment-24674051-20151005151004

The seer ability does not work in neverland because neverland is a land without time. That was clearly stated in the conversation between Rumple and Pan, and Rumple was clearly trying to use that power. So I would also take that to mean that it likely still works in Storybrooke.

I think it's more of a situation that Rumple has to focus concentration to actually use the ability (Otherwise, he'd probably go even more insane than he is already). And there has never really been a need for that ability to be used.