Honestly? I'm halfway expecting Oda to segway into ANOTHER flashback, somehow. If only to keep the gag going. Maybe Loki runs into Crocodile and we learn Crocodile's entire backstory! Or Mihawk! We could get Mihawk's entire backstory! I wouldn't even be that surprised at this point.
But, seriously, I think we have a few more chapters. There's a few things we still need to cover. Like why there seems to be this conspiracy to make it seem like Loki's the bad guy, here. Loki's probably just sacrificing his "good name" in order to protect the memory of Harald and all the good he's done, but we probably need to spell that out.
And we could cover some of Loki's time as a pirate. Maybe we could see Loki try and fail to join the crews of the various Rocks Pirate remnants. Loki's too late to join Rocks, but I could see him wanting to at least team up with the guys who originally worked with Rocks, and seeking them out during his "exile". It'd be interesting to see Loki meet up with Whitebeard and Kaido and Big Mom and Shiki and comment on how all of them have changed or have forgotten the original mission Rocks was planning in the first place. Trying to join each of their crews might be why Loki proposed to Lola.
Plus, there's the Shanks fight. I doubt we'll get a full fight. Maybe a double-page splash clash at most. Oda probably doesn't want to reveal how Shanks fights right now. But, supposedly, all the strongest warriors of Elbaph tried to team up to imprison Loki at some point, so we really should see that part of the fight. I doubt we'll see the whole "Trial of Loki", but we may get part of a chapter. Even after that fight, we could see Shanks visiting Loki a few times after he chains him up, since that's probably why Shanks was visiting Elbaph at the beginning of this arc. Keeping Loki informed on what's going on in the outside world.
Plus, we need to see how Mosa originally got into contact with Loki. If it is Shirahoshi, it's just strange she sent a Transponder Snail over to him. Unless it originally was a..."wrong number" or something, and they just happened to hit it off? I don't know, I would like to see how that started.
Plus, maybe how he got that...Cult (?) that wanted to serve him? Those guys in rags we saw at the beginning of Elbaph that we know NOTHING about. I guess those guys could be his old pirate crew?
There's actually enough backstory to cover that we could still be here for a while. I'm not even sure how long, honestly. Or maybe Oda really is going to skip all that, and it really is just over with the "BANG" Oda talked about in the Jump Festa letter. But, honestly, that'd be kind of a shame. I do want to get back to the present, already. I'm beginning to forget what the Hayheads looked like. But, I also want Oda to fill in some of these gaps in the story he's left, too.