The MCU will have to create a bigger multiverse in order to top the scale of Avengers: Endgame. Phase 4 of the MCU has been shaping the concept of the multiverse, with releases like Loki, Spider-Man: No Way Home, and Doctor Strange in the Multiverse of Madness introducing complex rules and characters that may converge in a franchise-wide event as iconic as Avengers: Endgame. But if the MCU's multiverse really is brimming with infinite possibilities, then it will need to be much bigger than Phase 4 has made it out to be.
Marvel comics have introduced endless alternate realities, each filled with wildly different versions of famous characters, which can range from almost exact copies of their main counterparts to bizarre variants like zombies or anthropomorphic animals. Up until Doctor Strange in the Multiverse of Madness, the MCU has touched upon alternate realities such as the Illuminati's Earth-838 timeline/universe and the home universes of Tobey Maguire and Andrew Garfield's Spider-Men. But despite the suggested possibilities— and potentially cataclysmic dangers — of the multiverse, the MCU has only scratched the surface of what it can really offer.
Just like the Infinity Saga began with the careful introduction of the original Avengers and concluded with a franchise-wide crossover event, the multiverse set up by the end of Doctor Strange in the Multiverse of Madness only seems to be the first step toward a much bigger event, similar to Avengers: Endgame. While this is a strong start, the MCU's multiverse has to greatly expand in scope by the time that event–whether it's the MCU's multiverse adaptation of Secret Wars or something else–arrives. In order to have a satisfying conclusion, the MCU's second saga needs a real "multiverse of madness" that unites multiple alternate realities in a movie of unprecedented scale.
One of the biggest risks in this expansion of the MCU multiverse is overcrowding. Phase 4 already has a considerable increase in yearly releases, including all the Disney+ shows. Collider
