We agree on the timeline. The released title of the last episode could hint at his first meeting of the children of the forest and Bloodraven. So that would make a very slow season for Bran (especially since they don't introduce Coldhands). The only plot I could think of to spice things up would be for him to encounter some of the rogue members of the Night's Watch that stayed at Craster's keep or maybe just some of Craster's daughter-wives and have hell knows what happen (but I'm not good with predictions).
Jumping the shark to season 5, what I was thinking about more precisely was that it would be cool if Bran revealed Jon's parentage while Jon is being murdered
. That's just a wild guess but seing how they changed the visions from THOTU, I'm pretty sure they won't show Bran's visions as depicted in the book.