Don’t make an Ant-Man threequel that’s really a low-rent Fantastic Four movie in disguise and don’t make a Thor fourquel that shows contempt for the characters.

Source: https://www.digitaltrends.com/movies/mcu-sequels-bob-iger-wrong-about-more-marvel-movies/

If the fifth movie wants the same net profit as the fourquel, it'll need to make $1.1 billion worldwide - which is a decidedly high bar for the installment to reach.

Source: https://screenrant.com/indiana-jones-5-budget-problem-franchise/