In general the situation is closer to "Here is basically what folks want out of this, this is the game we wanna play. What do you guys want? What about everyone else? QMs? The point of this is to iron stuff out so that we are playing a different game that we both find fun."
Its possible what the QMs want and what the readerbase wants to see or what the playerbase wants to play are mutually exclusive in some or many instances, in which case, best to get that out of the way very clearly and firmly and obviously now, to save people the time and effort invested.
My personal take is closer to... well, here:
Like, this is a good opportunity to very thoroughly analyze what fucking sucks about the quest and what incentive gradients lead inevitably to actions and situations that we are all kind of unenthused by, and then fix all of that shit. Let's not just settle with an extension of whatever we've been doing so far, because whatever we've been doing so far has CLEARLY got some seriously unfun bits that we can just agree to strip out while we're at this point.
And this includes stuff that just fucking sucks from a story perspective. If "this story has very low levels of kung fu wizards and adventuring stuff..." is an issue at the moment, then we can fix that right now. If "how does everyone else fair while Hazou's PoV is privileged and time passes" is an issue, then we can fix some of that right now. If "man it kind of sucks that the PC literally cannot be relevant to the main story stuff outside of this lighthousing research stuff" is an issue, then we can fix that right now!
Break the mold lol.
Ultimately, the result of the game we've been playing so far is "After succeeding more than anyone in his position at Chapter 1 could possibly have ever succeeded without magical outside context information, Gouketsu Hazou is assassinated by Orochimaru in the woods 700 chapters later.". Returning to that and figuring out if there's a path forward next is ultimately a question of "Alright, so that was the end state there, but how do folks feel about continuing on in some way, yknow, to make a better ending for the story and play a fun game."
So lets do that, and not worry so much about engaging with "simulationism" or "game balance" as we have done so in chapters 1-700. Anything that comes after this can probably be simulationist in the sense that we can almost certainly cludge together some bullshit that fits in seamlessly with vague worldbuilding stuff already mentioned or foreshadowed. Any game balance stuff can be with the lens that, well, we lost the Ultrahardcore version of the game, so instead of it being grueling and terribly balanced and the Balance Of All Things constantly consumming an entire spoon drawer on the GM side every week, lets just like, not worry so much if Hazou fucking around in the Afterlife or the Planeshopping shit or whatever can go from chuunin to throwing hands with Hidan in 1-2 in game years of subjective time off the Human Path.
Personally, I find Shroom's suggestion of "Spend 100-200 chapters romping through everywhere in-setting that isn't the Human Path, and return to kick major fucking ass after inventing and acquiring some serious powerups." most appealing. I have already done the thought experiments on how to make that work while keeping the players happy with significantly less/zero boring lighthousing, and it seems pretty viable to me so long as the general QM consensus is "That sounds fun" and not "Gee, 2/10 wouldn't want to write that". Something like that or a big afterlife powerup arc (that is not just sitting on the beach and doing kata with Jiraiya and Akane or whoever... and that has minimal direct interactions with any Deus ex Machina stuff or anything of the "You wake up with your giga buffs after a short stay in the graveyard dimension" variety) would be the most narratively satisfying given the current character arcs IMO.
That's just my two cents though.