Despite Scarlet Witch's central role in Phase 4 starts a new Marvel saga with a revamped lineup of superheroes after the departure of Iron Man, Captain America, and Black Widow. Now, characters like Falcon, the Winter Soldier, and Scarlet Witch lead their own storylines. A new universe-wide team-up will not happen anytime soon, but the MCU still needs a new leader who can spearhead Earth's Mightiest Heroes if the situation calls for it.
Seasoned heroes like Thor, Hulk, and Hawkeye are still alive and active after the events of White Vision will be more than busy trying to find himself after being torn apart and rebuilt in WandaVision.
Doctor Strange 2 Theory: Scarlet Witch Destroys (& Rewrites) The MCU's Reality
Wanda Maximoff opened Phase 4 of the MCU with her own show, where she finally earned her Scarlet Witch title. She might now be the most powerful MCU character, as she's still likely to open the multiverse and have a hand in the arrival of mutants, but she may not be the most influential MCU hero just yet. While Agatha Harkness confirmed Wanda's power "exceeds that of the Sorcerer Supreme," it's Doctor Strange who's destined to be "the best of us," according to The Ancient One, who referred to his role as the most influential Sorcerer Supreme.
Ant-Man and the Wasp: Quantumania. Although the Time Stone from the main timeline has been reduced to atoms, these two villains represent an undeniable threat to the universe. Doctor Strange can't simply ignore them.
On top of his job as the world's most important sorcerer, Doctor Strange is also the most appropriate Avenger to lead the next generation of superheroes. Magic has become one of the central powers of Phase 4, and Doctor Strange is the most experienced Avenger when it comes to magic. A leadership role fits perfectly his character arc, given he started out as a self-centered professional and may end up as a selfless teacher, which is what the ideal Sorcerer Supreme should be. Although Scarlet Witch's power could help the heroes much more, she still has all her attention on recovering her lost children and learning about her Darkhold prophecy. Besides, Benedict Cumberbatch's Doctor Strange has all the charisma to fill the Robert Downey Jr.-shaped hole Tony Stark left in the MCU.
