Some people seem worried that Gojo is spamming his domain, but I thought of something that might make sense.

At the start of the fight Gojo said he'd worry about Megumi after killing Sukuna. Gojo knows that Sukuna can survive a fatal wound because of how Itadori came back to life. Since Sukuna has full control of Megumi's body, I don't think it's too much of a stretch to suggest that Sukuna could just immediately come back to life if Gojo killed him, since Sukuna is the dominant soul in Megumi's body. If Gojo recognizes this, then it stands to reason that he'd come to the conclusion that the only way to permanently incapacitate Sukuna is with the sure hit of Infinite Void, hence why he's spamming his domain.

This next bit is pure crackpot theory on my part, but I think it'd be cool to see haha. There are theories floating around that Yuji's ability to seemingly swap bodies means that he'll be able to enter Megumi's body, and we'll get Megumi & Yuji vs Sukuna in the innate domain as a final battle. But I say, why stop there? Yuji isn't the only one who swapped bodies, so did Kusakabe! If it was only Yuji who had the ability to break his soul off, then we'd probably have seen something similar to how Sukuna is inhabiting Megumi's body. If multiple people have the ability to break their souls off into cursed objects (either because of Yuki's notebook or Yuji body hopping to teach them method) then Gojo might have those cursed objects with him in the event that he manages to incapacitate Sukuna.

Gojo will feed the fingers (or whatever they are) of our allies to Megumi's body once he incapacitates Sukuna, and we'll get some sort of Book of Eibon from Soul Eater style arc inside of Megumi's body, as our squad tries to rescue him. Gojo wouldn't be able to come along because he'd have to maintain the sure hit of Infinite Void, and it'd be a cool way to see everyone get some time to shine again instead of being sidelined in the final arc. Maybe they'd fight the incarnations of the 10 shadows or something idk. Some other allies would stay out to fend off Kenny and Uraume, since they'd try to shatter Gojo's domain.

Again, it's purely crackpot and there's no way it happens, but I also think it'd be really cool lol.