So the upcoming return episode of AoS's synopsis got me thinking:
After discovering an alien city with ties to his resurrection, Coulson and his team destroyed it before the forces of Hydra could claim its secrets, eliminating the villainous Whitehall (Reed Diamond) in the process. But new threats to the world have arisen, including Skye's father, Cal (Kyle McLachlan), who now seeks retribution against Coulson for stealing his revenge against Whitehall; a disturbing alliance between former S.H.I.E.L.D. agent Ward (Brett Dalton) and Agent 33; the enigmatic Raina (Ruth Negga), who struggles with her transformation into something inhuman by the alien Obelisk and seeks vengeance; and Skye (Chloe Bennet), who developed mysterious new powers from the Obelisk but whose lack of experience with her new abilities may threaten the safety of those she loves.
Meanwhile, Bobbi (Adrianne Palicki) and Mack (Henry Simmons) begin the next phase of a plan which seems to have grave repercussions for Coulson and his team, who are unaware that there's another mysterious force moving against them. And as Hunter (Nick Blood) is forced to make the biggest choice of his life, Coulson will find his mission threatened by this shocking endgame. In the midseason premiere, "Epidemic," Coulson's team must deal with the consequences of their war with Hydra as shocking revelations threaten to tear them apart, and Hydra makes a dangerous move that may involve a traitor in S.H.I.E.L.D.'s midst.
Wonder what that's about? Especially in regards to Captain America - Civil War. Could that "mysterious force" possibly be Maria Hill? Could this be a long term set-up for repercussions in Civil War? Could Skye/Daisy's and Coulson's Inhuman influence (and powers in Daisy's case) cause Hill to wonder if Coulson can be trusted to run SHIELD? I could definitely see that causing tension and even outright conflict. Maybe not, but it'll be interesting to see how and what effect Civil War has on the show. Civil War would also be a good choice to reveal to Cap that Coulson is alive, and utilize Coulson, Daisy/Skye and the loyal members of his team (May) to support Cap (not big roles, just an appearance by Coulson, a few lines to explain to Cap how he's alive, maybe humorously), and essentially just cameos for the others, as the film will undoubtedly be quite crowded already with Cap, his supporting cast, Tony Stark, presumably Black Panther and Spidey, etc.
But the film will almost certainly have some level of "big throw down", and Cap will likely have Falcon, maybe Black Widow (assuming Scarlett stars in the film), Bucky/Winter Soldier, perhaps Nick Fury, Black Panther, and hopefully at least some of the AoS team (Coulson, Skye, May) versus Iron Man, War Machine, perhaps Maria Hill and maybe Spider-Man... and for sure a bunch of Iron Man drones. It would be crowded, but many of those characters would just be cameos: Fury, Black Panther, the AoS team, War Machine, Maria Hill, Spidey would all be small roles/cameos depending on the character and their importance to the plot... some would likely be more of a supporting role.
It would be the best way of bringing the AoS cast to the films in a small and perfectly serviceable way, and would make complete sense for the plot and characters (I doubt Coulson would sit on the sidelines with Cap in trouble and him and his team able to help... even if it means going up against Tony Stark and his allies).
Still at least a year away and necessitates AoS getting a third season, though with the improvements made in the first half of Season 2 and the hype around its return, I think that's pretty likely. Really glad they fixed the problems of Season 1 (mainly large swaths of uninteresting writing and characters no one really cares about because they were made up for the show and had no connection to the comics)... now they're pretty regularly introducing characters from the comics: Skye was revealed to be Quake/Daisy, Cal is Mr. Hyde, Creel/Absorbing Man showed up, Bobbi Morse/Mockingbird is a regular cast member now, Raina might be the Raina from the comics (who was a mutant I believe) but with the MCU twist that now has her as an Inhuman, etc. Critics certainly can't blame the show for having no "super powered" characters from the comics any longer, and the writing has improved quite a bit.
The show has definitely become worth watching, and it'll be interesting to see how they tie it into the upcoming films:
Avengers - Age of Ultron
Ant-Man
Captain America - Civil War
...and so on. Most definitely will be interesting to see it Skye/Daisy, Coulson, Raina, and anyone else affected by the Kree blood will play roles in the eventual Inhumans film alongside the comics characters like Black Bolt, Medusa, etc.