I’m not sure we will see SB again. Henry said he always expected everyone to go back to the EF one day. Plus, purely form a storytelling perspective, SB has served its main purpose, which was to house the residents of the EF during the curse. Now with the curse broken and the option of returning home, I don’t see why they’d want to stay in our world. Also, it’s too hard to have 3 simultaneous plot-lines going. In the first part of S2, it was really dissatisfying to a lot of fans to keep track of SB present, EF flashbacks, and post-apocolytpic EF all at once. By eliminating SB, we will mostly focus on NL, EF flashbacks, with maybe just a quick glimpse of the dwarves and fairies back in present-day EF. But the major focus will be NL for the first part of S3, and maybe moving on to Oz or other lands by the second-half of S3.
Oz! Yes, Oz! But I think you’re right and it was hard (for the more casual viewer) to keep three lands and times in their head. So I think we’ll have something similar to S1, NL of the past and NL of the present. But I can also see them having one or two filler episodes where we leave NL and check in on the cast in the EF.