Dabb said Lucifer's story is over, but not necessarily Mark's. Potentially, Lucifer coud awaken in the Empty, but the cosmic entity could choose not to send Lucifer back, but decide to look for what's causing all these angels awakening by using Lucifer's form, since it was him who caused him to wake up this time.

And as much as I like Lucifer as a villain, I didn't like his storyline until the very end when he became menacing again. It was clear that the writers weren't sure what to make of him, and I think some interviews from SDCC showed me how right I was. If he is to come back, I hope it isn't next season.

Now, the latest spoilers made me very excited about Michael in the next season. Idon't think they'll get rid of him quickly they said so in the interview/panels, and they'll find a way to have Dean AND Michael (played by Jensen) at the same time.

I think it'll be interesting to see Michael's intentions and methods. From what I've read and heard (the audio of the scene from S14 they showed at SDCC) it'll be good. And it seems like it won't be angels vs. demons war, since there are only about 10 angels left amd Michael has to use other methods to further his agenda.

Also, Mark P was a series regular in S13. I would like to see him on the show, but not as Lucifer.