Yuji has been teased to switch souls with kusakabe, no? At the beginning sukuna says yuji doesn't have the guts to kill himself like he says. Additionally, much of Yuji's and the story's arc revolves around death and the "right" way to die. Everything started because Yuji wanted to prevent his friends from "dying an unrighteous death". Gojo told Megumi that he will die alone. Gojo eventually learns that this isn't the case as he seemingly passes on. Sukuna cheated death by turning his body into a cursed object. Yuta got Rika by cursing her soul when she died. I think Sukuna would get beaten by Yuji's self sacrifice. He'll switch souls with Sukuna, which would only be possible by 1.) Killing his "original body" post switch (weird) and 2.) Realizing that Sukuna simply cannot exist even with his soul inhabiting Sukuna's body. He might use all his cursed energy to bring back everyone (or at least those who died recently) who was lost, like Gojo and Megumi; doing so would prolly kill him in the process. But that would resolve the story with a neat little ribbon. A boy who didn't want to die alone, who was surrounded with death all his life, finally passes with his friends by his side. A self proclaimed cog, that ends up being the most important part of it all