I thought someone posted here that they were going Cosmic; GotG, Ms. Marvel, etc... There is a lot that can be done there and it’s slowly leading to that anyways.
Here’s hoping for Dark Phoenix
There is a X Men Dark Phoenix already going with Sansa Stark. Going to to be still separate. Thats why we know Xmen, even after the purchase, is a long ways from joining this Marvel MCU.
This phase still has IW, Ant Man 2, Marvel, Avengers 4
After that we still have GOTG Confirmed, Spidey 2 confirmed, Strange 2 all but confirmed. They have 2 films slated in 2020, 3 in 2021 and 3 in 2022....
No way there is a reboot on the universe, they will just continue with newer characters and arcs, and likely Cosmic as you mentioned. Then maybe reboot down the line.
Downey has been in what, 8 movies? with two more to go? Cap has been in 7 with 2 to go? Similar Numbers on Thor
This will be just 3 for Star Lord and the Guardians, 3 for Dr Strange, 3 for Panther, 3 for Spidey. Those are your new three MCU leaders after this movie.
My dream is this movie ends with Thanos Defeated and escaping Earth, leaving 1 or 2 major characters dead, with a few minor characters dead as well. Avenger 4 is the remainders joining with some new characters and trying to stop thanos once and for all and succeeding. Close the book on these days and get behind the new 3 big names going forward, and the OG Avengers are all gone. After credits scene sets up a new big bad just like Avengers 1 did with Thanos.
maybe by that point they could tease Doom. But ideally post credits in Avengers 4, Guardians are drifting through space and get a report from Nova Prime of a missing planet. Star Lord - "What do you mean a whole planet is missing?"
Flash across the universe and you see aliens going about their lives, as a Shadow in the shape of Galactus head blocks out the sun. People look up and scream. The End.
Then you get get 5-6 movies setting up for The New Avengers (Avengers 5)