Secret War/Secret Invasion -> Civil War -> Fallen Son
What if:
1) Agents of SHIELD Season 2/3 focuses on Secret Invasion, where the Skrulls have infiltrated Earth. Now, I don't know all the legal mumbo jumbo with Fox, but if they can't use the Skrull, then they can use Inhumans (thereby substituting shapeshifters for Terregenesis). This opens up so much to the MCU, and can cross over with the Netflix shows (they'll need the boost). I also think the blue alien in T.A.H.I.T.I. was maybe Namor's father and that leads to a Defenders/Namor crossover. With Inhumans and Atlanteans, Defenders and SHIELD, they are well on their way to enough characters for Civil War. Oh yes, in my world Sony agrees to let the MCU use Spidey, but the Ultimates version so as not to reboot their own spinoff movies.
2)While all this is taking place, on Captain America 3 the Russo brothers are doing Secret War, the one with Daisy Johnson, where Nick Fury assembles a team with Cap, Widow, Luke Cage, Daredevil, Hawkeye and Mockingbird (can't remember if Spidey was in this storyline) to fight a Hydra team led by Baron Zemo, who they can replace with Kraken because he is already established and proven to be bat sh*t crazy, leading Crossbones, Bucky and other Hydra folks. Iron Man can be in an end credit cameo here, he's not really needed untill...
3) Avengers 3: Civil War. By this time, Marvel will have established enough characters and crazy storylines to warrant Civil War. While all the Earth people are fighting among each other, Thanos can swoop in to get Loki's staff, meet up with the Inhumans and kill Captain America. This can turn Bucky around to take over that role, and....
4)lead into the untitled Fallen Son movie, leading into a whole new slate of Marvel movies with Secret Avengers etc.
What do you think? Crazy enough to work?