Re: Avengers a culmination of Marvel history (including 616/Ultimate/etc.)
I'd say Avengers was basically an Ultimates adaptation, but with classic, 616 personalities.
Dream MCU phase 3:
2016: Thor: Ragnarok, Doctor Strange
2017: Captain America: Secret Empire, Black Panther
2018: The Incredible Hulk: Rise of the Leader, Guardians of the Galaxy: War of Kings
2019: The Inhumans, Avengers: Thanos Imperative