Yeah, two more seasons and it's done. Sadly I do think Dexter will end up being "normal"
With Deb knowing, it might mess her up for a bit, but she'll realize the good in him and lead him on the road to humanity
One storyline from the books that I wish they'd go with is a cult that believes Dexter's "dark passanger" is a demon and end up worshiping him. But they've gone pretty far from the books as Rita is still alive and I think they had a daughter, so yeah Showtime has taken some creative license.