Not confident at all. Kinberg wrote X3 and Apocalypse, and I'm not convinced he was the sole writer for DOFP (a lot of the dialogue and story cohesion isn't like his normal work, even for non-X-men films). His basic formula is: drama + death fodder = MORE DRAMA. He did it in X3 and Apocalypse and, from what I've seen from the DP previews, he hasn't learned his lesson one bit.
That, alone, worries me the most. BUT...I'd love to be proven wrong. I really want this movie to be good and, from what I've seen, Kinberg really put his heart into this. So if it's the best he can do and it's still a turd, then he needs to never touch the script for another X-men movie again.