Doctor Strange was certainly popular enough to earn a sequel, which makes it a candidate to occupy one of the dates, and it’s hard to imagine Marvel not creating a complete Ant-Man/Ant-Man & The Wasp trilogy.
Sight unseen we can probably count on eventually getting a Captain Marvel 2 as well, and if we assume that Iron Man, Captain America, and Thor are all done as series, there are four spots left.
To start with sequels, it’s pretty easy to guess that Black Panther will get a follow-up thanks to its insane box office success, so that brings us to seven.