I know Spirit doesn't like to talk about box office figures, but "sequel fatigue" is something BOM has mentioned repeatedly, and since a mostly tentpole release schedule is what Disney's entire Studio strategy revolves around, it's worth mentioning.
Day-to-day comparisons show Cars 3 and Transformers 5 trailing their predecssors in the US (the latter by a very wide margin), neither likely to make $200 million domestically, just like Pirates 5. Pirates 5 will also probably make $200 million less at the foreign box office than the last one and Despicable Me 3 just opened in the US with a total lower than 2. This does not get into how GotG2 made less than Disney hoped, or how Furious 8 made less than 6 & 7 in the US, despite doing massive business eleswhere. At a certain point, people get tired of seeing the same thing over and over again, and then there's a scramble to get something else like King Arthur off the ground, or a revival of Independence Day, and we've seen how that goes.
Disney used to have a much better balance of lower budget, sometimes "adult" fare and major releases, and even some series like The Mighty Ducks didn't cost $200 million a piece to make. They should look into doing that more, because outside of Marvel and Star Wars, nothing is a guarantee. Not even Pixar anymore.