Well, one obvious step would be to not start off with the boy and the girl in a relationship. The "become a hero while
getting the girl" trope is the cinematic norm for good reason.
Also, between The Aviator
and the Starks, the whole Howard Hughes thing might be a bit overdone at this point; might be best to come up with a different origin for the jet pack. Emmet Brown, Sr., anyone?
Stretching it a bit, but with this being a Disney property, could they conceivably link it to the Marvel Cinematic Universe?!
That could be interesting. A Cap cameo, maybe?
If this were
to happen, it'd be nice to make it more international than the Johnston movie.