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I was thinking about how much Gege emphasizes Yuuji's death from the beginning of the manga.
First with Wasuke's words when he asks his grandson not to die alone like him. Then there's that obsession of Yuuji's to have a dignified death and not die in vain. It's also very curious how just before Sukuna takes over Megumi's body, Yuuji is thinking about how he is ready to die alongside Sukuna when they are executed. Not to mention the words Yuuki tells Choso, about how he should live for Yuuji, because if he dies, Yuuji would be left all alone... And well, Choso is already dead and Yuuji has no one left.
I think it's very likely that he will decide to die together with Sukuna, because you have to remember that despite everything, Yuuji still feels guilty for what happened in Shibuya and maybe he's looking to redeem himself with his sacrifice.
And Gege also overemphasizes that for Sukuna love has no value and that he has always been very lonely. Neither Kashimo, nor Yorozu nor Uraume and neither Gojo have been able to teach him what love is, perhaps it is because the person destined to do so is... Yuuji?
oml reading this made me emotional again, i agree so much!! And yeah, at this point, there really is no one left to answer Sukuna's love confusion but Yuuji ;_; I still wonder how Yuuji's going to do that though.
For Yuuji to truly grasp the situation at hand, for him to "save" Sukuna, he'll have to understand him first. To do that, he'll need to know his past.
The fact that Gege made his domain related to touching the soul and spirit itself,,, is just so wonderful to me. Because this links Yuuji to Sukuna in a very delicate, somewhat sensitive manner, in a manner Sukuna has no defence against. In trying to save Megumi, could Yuuji accidentally sync himself to Sukuna's soul? would that propel him into the memories stored deep within Sukuna's soul, thrown completely off guard? Is Sukuna going to let his memories be read? Or would he even care? Will he use his experiences as a justification for upholding his current ideology against Yuuji? and How would Yuuji react to them being related to each other? Would this solidify Yuuji's belief that in putting down Sukuna, he'll have to perish along with him?
So that they both could get a new start, in another life? Where perhaps the inclusion of one other person could prevent Sukuna's downward spiral into utter destruction?

That perhaps the love of that person, could save him from the his Loneliness?
This just has too many possibilities and i'm just clutching at my heart at the moment, i sincerely HOPE Gege doesn't fumble this wonderful opportunity to help develop Sukuna as a character further.
Clearly, it makes sense why the first chapter of JJK is titled as "Ryomen Sukuna", this story is about Sukuna and Yuuji, right from the very start.