Eh, I gave up hope that Revenge would stop being predictable in S3. Also, I just like the two of them together and Jack and Emily have no chemistry. I wouldn't be opposed to an ending where she doesn't end up with anyone though.
I agree, after he got married to Amanda (the dead one ) both of their characters have grown too far apart that even the thought of them reuniting doesn't feel right.
Again, I really wish the series ended after Malcom's death, not here for every side character to have their "Revenge" era.