It's risky. If a movie flops, it can cause a chain reaction of flops. Also, there's the risk that the entire superhero genre becomes oversaturated. It's not risky at all. They're not making the films simultaneously; its a planned schedule. Just because they announced those films doesn't mean they have to make them. If the genre starts to tank, they can just stop. .But if a film tanks, it's gonna tank big, and that's going to effect anything that is in production. Remember, these take years to make; if film A tanks, films B and C are in production. Do you keep on track? Do you call it a loss and stop? The latter seems very unlikely: Marvel depends on these films to make profits. No one will be thinking sunk costs. So they continue with B and C, hoping the A was a fluke. If B flops, then do you complete C and continue on D? Maybe C will be a blockbuster . . . If the genre has run its course, then billions could be lost. It already growing very tired from a storytelling point of view. There hasn't been an original superhero film since . . . Burton's Batman, maybe. Maybe even Superman vs. the Mole Men. It's always the same story: eeeeeevillll villain shows up and goes head to head with the hero(s) in hours of fight scenes (which always bore me). The genre is an artistic dead end, and eventually, Marvel is going to hit the brick wall at the end of it. The only question is whether they can hit the brakes before they crash into it.