Second, looking at the way the MCU’s 2021 calendar is currently presented, we have movies in February, May and November. That leaves a pretty big gap in the calendar during the summer months. So I don’t think it is impossible that with Black Panther 2 or whatever mystery movie it is moving up to February, another title will be slotted in somewhere over the summer, leading to our first year of four MCU movies. This is, of course, just a guess but I don’t think it’s out of the question, especially if the Disney/Fox deal goes through and Marvel has a lot of new toys to play with. That many new characters would necessitate more movies depending on when and how Marvel wants to integrate them.