That all sounds great. If I had to pair down my wishlist to just my top three things from your list, you'd still be left with the things in bold. Even that would be a lot to do correctly in one film without those characters having been introduced already, which they haven't been. But with the MCU always expanding, we may get to see it all somehow in the years to come. EDIT: and as for where to go after Surtur, that's when I'd move Thor out of the 9 Realms and do Beta Ray Bill or something else cosmic, OR (as Joss Whedon says regarding Avengers), go "deeper" or more personal rather than "larger" with the threat.