As we've already seen, when Yuta first tried to use Blue it required both hands and only amounted to a small spark which he held no control over (allowing Sukuna to catch him off guard), and then when he tried it again he completely failed at even manifesting it, Yuta even comments throughout this chapter at how hard the Limitless is to use. Then we see the Hollow Purple, Yuta already apparently needs to use chants and build up to activate it - something Gojo could do without on his first attempt after learning how to utilise RCE - and every time Gojo uses Hollow Purple we see a visual of the two infinities (the white circles) overlapping to symbolise the collision, with Yuta the circles are barely even touching. Given how unlikely it is for Yuta to narratively be the one to beat Sukuna, and how fatal a 100% Hollow Purple is meanwhile he's charging a 120% Hollow Purple, AND the fact Sukuna can't even sustain too much damage without UV landing, I doubt we'd see a successful Hollow Purple from Yuta. Instead I could see it being:
a. It's just a plain dud, maybe some purple CE sparks, but no big blast
b. It's a dud, but Yuta instead fires off two separate orbs of both blue and red which hit Sukuna and deal some substantial damage
c. It's somewhat a dud, a purple blast rushes forth but, even by Yuta's standards, its potency is pathetic
As a Yuta stan tho, this is obviously rough to think about lol. There's other ways Sukuna can survive though which don't rely on Yuta failing at becoming the second Gojo Satoru. These being:
a. Some kind of BV, he sacrifices something big in exchange of concentrating all of his CE to reinforce his body. Something like what Hakari did against Kashimo but on a far larger scale - potentially on the scale of Miwa's BV. Sukuna does have a lot of techniques he could sacrifice, and this would be a good way to weaken him for Yuji to carry the torch.
b. Uraume appears, having killed off Hakari off screen, and does.... something? I don't like this one...
c. Sukuna can't move, but he can still utilise CE, perhaps he activates the 10S. Either utilising rabbits escape to fall into the shadow beneath his feet or summon a massive totality which can mitigate the damage he sustains.
d. Sukuna has STILL been holding back and simply tanks it because he's Sukuna... I dislike this one too.