So in 2015 we have:
the continuation of Agents of SHIELD season 2
Agent Carter TV show
Avengers 2
Daredevil TV show
Ant-Man
Jessica Jones TV show
then in 2016 we get:
Captain America: Civil War
Iron Fist TV show
Luke Cage TV show
Dr Strange
Probably Agents of SHIELD season 3
Maybe Defenders TV miniseries (or the next year)
then in 2017:
Guardians of the Galaxy 2
Thor: Ragnarok
Black Panther
Maybe Agents of SHIELD season 4 and other TV shows
then in 2018:
Avengers: Infinity War Part 1
Captain Marvel
Inhumans
TV shows?
then in 2019:
Avengers: Infinity War Part 2
And probably other stuff
wow.
Seriously.
And the Defenders mini definitely comes out in 2017.
Really hoping they get Cumby as Doctor Strange to cameo in Defenders, or even have a substantial role if they can talk him into it. But if not, a simple cameo, much like Fury's in the first Iron Man. He appears at the end of the Defenders series and recruits the four heroes.
A Defenders feature film comes later, maybe in 2019 or afterward.
With Marvel wrapping up the plot lines of the main Avengers characters (Cap, Thor, Iron Man, Hulk, Black Widow, Hawkeye) by the end of Infinity War, Part II, it's obvious Marvel is looking forward past A-IW2, and lining up new heroes beforehand: Ant-Man, Black Panther, Captain Marvel, Wanda and Pietro, etc. It would allow Downey to still occasionally appear in cameos (something he's said he's very open to, especially since those roles don't involve a lot of physicality), and leave the action to the new team.
I'm sure GotG2, Captain Marvel, Inhumans, will all have some elements tying them together besides just the cosmic angle. I have a feeling they'll all serve, to varying degrees, as a prelude of the Infinity War films.
Seriously, knowing they're splitting Infinity War into two films leaves a lot of room to include... well, everybody.
The new Avengers team (Captain Marvel, Black Panther, Ant-Man, Wanda and Pietro) form in the aftermath of Age of Ultron and the likelihood the team splits and some members perhaps even die. The events of Civil War will undoubtedly impact the new team in some form.
By the time Thanos shows up with the fully loaded Infinity Gauntlet on Earth at the beginning of Avengers - Infinity War, Part 1, the new team will likely be completely outmatched. Hell, the old team would've been. Part 2 will hopefully have the original team (Cap, Tony, Thor--assuming he survives Ragnarok, Hulk, Rhodey, Widow, and Hawkeye), the new team (Ant-Man, Black Panther, Captain Marvel, Wanda and Pietro), the Guardians (Starlord, Gamora, Drax, Rocket, and Groot), Inhumans (whichever characters appear in the Inhumans films, well, they'll go here) and a host of other allies (Kree, Inhumans, Asgardians... assuming there are any left after Ragnarok, maybe the Defenders), etc. Then it's a battle royale of superhuman proportions. That is a war I'm looking forward to seeing onscreen.
And I assume the Russo brothers are directing both parts 1 and 2 of Infinity War. That should be a lot of fun.