Honestly if that happens we can have them talk about doing this over crystal as the means of discussing through it, since Wangji still has the bow/sword/etc if I'm not mistaken? Not that Wei Wuxian thinks true love never dies (he's more inclined to think it does) but yeah, he also doesn't know Arha's parting asshole words

drops these off and says "he's finally not killing innocents anymore but also you should move on because you let it happen" then again is she even lingering, hopefully she's all gone long ago and this is a more "and so, the tragedy ended"