I agree that they could have done more with the premise, but I did like the ending. What I found interesting is that they seem to be setting up Bobby as a sort of Shojo himself. A mean old drunk who appears to other drunks as a ghost? It's poetically appropriate.
I'm not sure how I feel about Bobby being a spirit,…

To me, I think Lincoln represents a link to Olivia's old life. As her memories are gradually taken over of Peter, Lincoln remains to remind her of who she was before she was Peter's Olivia. In that way, Olivia can still be both versions of herself even if she's chosen to go with one over the other. So, I suppose, can…