Warning: contains spoilers for New Mutants #25 and Strange #2!
In Marvel continuity, Doctor Strange was Earth's Sorcerer Supreme for many years up until his recent death. The role is a major recognition of skill, often bestowed by the powerful Vishanti, but over the years, it has become devalued by the sheer number of characters who claim the title. However, with Clea now exploring the powers and limits of the role, it's the perfect time for Marvel to consolidate the Sorcerer Supreme title and make it truly significant once again.
The position of Sorcerer Supreme goes to exactly who it sounds like: the nonpareil magic-wielder in their world. Strange himself describes it as "a recognition of magical primacy." The selection process is a complex one based on innumerable factors, but one common way to get the role is via direct appointment, which took place at the conclusion of Death of Doctor Strange by Jed Mackay and Lee Garbett. In his final act before death, Strange bequeathed his role to his wife Lady Clea. As the niece of his nemesis Dormammu, Clea is no doubt a powerful sorceress, but her connection to the Dark Dimension introduces some issues for her new position.
If Doctor Strange's death revealed anything, it’s that not all dimensions are fortunate enough to have a Supreme as compassionate and protective as Stephen Strange. In fact, it seems that Strange was the exception to a group of miserly, myopic, and tyrannical individuals. After magic came under attack, the doctor had to force his counterparts from other dimensions to aid him against the Peregrine Child, a mutual threat which they could only have faced together. What's more, the little-known villains showed no outward interest in defending the denizens of their dimensions. While Doctor Strange may be an impressive Sorcerer Supreme, several of his Z-list enemies also claim this title, and some stories have suggested a functionally infinite number of Supremes throughout various different dimensions.
Perhaps the only other Supremes who actually make the title seem impressive are X-Men's Magik and Clea, but both are currently having issues with their roles. Magik is busy trying to pass her rule of Limbo to Madelyne Pryor, aka the villainous Goblin Queen, in the pages of New Mutants, while Clea has revealed that as the Sorcerer Supreme of both Earth and the Dark Dimension, her powers are at war with each other, as the different dimensions' energies refuse to coalesce.
While this introduces a compelling conflict for Clea, it's also an invitation for Marvel to consolidate the role to just one hero, or at least only a handful of characters, who will actually communicate the power and mastery the Sorcerer Supreme title should convey. Clea has made it clear she's ready to break rules to meet her goals, so the idea that her dual role is causing problems is a great on-ramp to a story where she asserts herself as the one, true Sorcerer Supreme of every dimension. This isn't as impossible as it seems - in older stories, Doctor Strange made it his business to address threats in many different dimensions, so a return to this idea of a single, literal Sorcerer Supreme would be a return to form. while also allowing Marvel to still include Sorcerers Supreme from different eras and alternate timelines/realities (which in Marvel lore are different to alternate dimensions.)
This concept could also be folded into Doctor Strange’s inevitable resurrection. For major heroes, death is temporary in the Marvel Universe, and it would be a fittingly grand return for Stephen Strange to return as the one, true Sorcerer Supreme. While every hero needs their own 'world,' allies, and enemies, the title of 'Sorcerer Supreme' has lost its meaning due to the many minor characters who possess it, and the recent eruptions in Doctor Strange's status quo offer the perfect opportunity to fix this problem.