Board Thread:Spoilers!/@comment-24674051-20161013043134/@comment-25375217-20161017211706

Well, keep in mind that Season 2 kind of did that too. Snow and Emma were in the Enchanted Forest for the first part, with the setup of Cora. Then Cora came to town, with the setup of Greg and Neal. Then Greg and Tamara did bad bad things. It wasn't split into arcs like Seasons 3-5, but it still had kind of the same formula as what you're referring to with Season 4 and what I could see happen in Season 6.

The Land of Untold Stories will still last all season, I'm sure, keeping the arcs tied together more than Seasons 2 and 4 did.