Been seeing lots of twitter folks speculating that the last page could mean the Deku's gonna basically trade OfA for Star's quirk New Order.
It's probably gonna be a case where the only way for him to be able to take down Shigaraki is from the inside, with all the OfA vestiges likely to run amok inside him, especially Nana. Deku obtaining New Order would be a tremendous ass pull in my book, but it probably would work out better for him than it did Star. If I remember right the reason why it didn't work out well for her was that she didn't know Shigaraki's actual name, and the super regeneration he had at the time made it next to impossible for her to do anything to him. Since Deku knows everything about Shigaraki by this point, potentially he could have complete control over him.
That said, I'd view a redeemed Shigaraki as a bad ending. Yeah, it's Deku's style, but Shigaraki is someone that realistically is way beyond saving, despite what Horikoshi might end up showing. Besides, even if he does survive then chances are he'd just spend the remainder of his existence in prison. What a life.