The theory puts Wanda Maximoff at the center of each universe, making her the instrument that holds reality together.

SUMMARY

Elizabeth Olsen’s Scarlet Witch could be holding the MCU together, posits Secret Wars theory.
The theory slots Scarlet Witch in for Molecule Man, whose demise could bring down the entire universe.

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Elizabeth Olsen’s Scarlet Witch is one of the highlights of the Marvel Cinematic Universe, being a character with a major following in the fandom. However, as of Doctor Strange in the Multiverse of Madness, the character was unceremoniously turned into a villain, and as far as the MCU is concerned, killed.
Scarlet Witch in WandaVision

However, a new Secret Wars theory has emerged, that may prove that the character is not only alive in the MCU, but is impossible to kill, given how the character might have picked the attributes of a different character from the comics. This could potentially pave the way for Elizabeth Olsen’s return to the MCU, and even cement her position as an important character in the narrative going forward.

Elizabeth Olsen’s Wanda Maximoff has taken over from Molecule Man in the MCU

Molecule Man in Marvel Comics
Elizabeth Olsen‘s Wanda Maximoff was labeled a nexus being, similar to Molecule Man in the comics. We have also seen that every alternate universe that we have visited in the MCU has the Scarlet Witch in it. The Secret Wars theory that we are referring to here essentially states that Wanda is going to be the MCU slot-in for Molecule Man, who is necessary to hold up the universes. If the Molecule Man of a particular universe dies, the entire Universe would collapse, something that becomes an active plot point in 2015’s Secret Wars storyline in the comics.

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Given how powerful Wanda is, the character may be in some sort of magically induced suspended animation instead of being dead, given that the character is probably scared to use her powers after witnessing the destruction she caused in Doctor Strange in the Multiverse of Madness. However, the character could be instrumental in defeating Kang, or whichever character takes up his place in the coming films. This neatly sets up Elizabeth Olsen’s return to the MCU, one that fans have been waiting for for a while.

Killing Wanda might collapse the universe she is in, putting the Illuminati in Catch 22 situation

Earth-838 introduces the Illuminati member, Mr. Fantastic in Doctor Strange in the Multiverse of Madness

If Wanda is indeed the lynchpin that holds whatever universe she is in together, The Illuminati of Earth 838 might not be so keen to harm the Wanda of their universe. Given that the Wanda who beat up the Illuminati hailed from Earth 199999, The Illuminati could invade and try to slay her, with renewed numbers, in the hopes of saving the multiverse.

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The Illuminati has made clear that they would prioritize their reality above all else, and this could mean they could invade Earth 199999 without any qualms against killing Wanda to safeguard their universe, which could put them face to face with the Avengers. This could lead to a new team of heroes assembling to form the new core team of the Avengers, who would carry the next few phases of the MCU.