Honestly I have a feeling they are going to get fucked first. Oda always makes it a mission to fuck over the protagonists first before letting them come back with higher resolve. For sure it happened to Luffy once, but Kaido's hybrid is a pretty nasty hype to let any one of them hold it off next chapter.
Plus with Big Mom right there, its something that justifiably needs to happen. I personally don't think the rooftop battle is the end. Once Onigashima lands in the capital (if it does), that battle up there will shift somewhere else.
Plus, we still have Zoro's apparent lineage to tackle and someone needs to explain that to him. I feel like that wont happen until he's back on mainland Wano after this first fight and Act 3 ends. Idk, just a feeling.
Plus, we still have yet to get a scene with Yamato and Kaido, and I feel thats pretty vital