Honestly? I FEEL this. I don't really watch One Piece like that but it really felt off that Kaidou was defeated like this despite being such a massive threat. It's like defeating a Final Boss with a basic attack like a punch or a sword slash, yeah it can work but holy hell man.
And again, how is that gonna reflect on everyone else now? Like you hyped up Kaidou to this unholy degree... but he's still alive now and is just "defeated". If the Marines kill him now, sure he's gone but it does nothing for anyone. Marines don't come off any stronger, Luffy has gotten so many breaks to even get that far that it comes off hilariously weird if we can just say he's on Kaidou's level and the most obvious part is:
How do you top Kaidou without it coming off as utterly ridiculous? Blackbeard suddenly is well beyond his level? Or Shanks being that much stronger? Akainu and the other Admirals get absurd level amps? And so on and so forth.
Yeah I know everyone is technically been improving throughout the story but there ARE limits to that without it just coming off as absurd. I always believed Kaidou should have NEVER been truly fought in Wano and been just a preview alongside Big Mom or them to liberate Wano without really defeating either of them even by technicalities. Like the Yonkou are supposed to be a HUGE fucking deal, like "The World Government will fucking COLLAPSE if 2 Yonkou alone tried to gang up on them" level deal. So even with the events how they are in Wano, it just loses the mystic when we know it'll either be similar or even worse from here on out unless suddenly The Blackbeard Pirates hit such an amp that Big Mom and Kaidou just comes off as ordinary or the Admirals get a major amp in that same fashion just to keep up.
I know it's weird coming from me but that's been my thoughts about Wano while I've been keeping up with it here and there.
I'm actually expecting a massive powercreep, as expected of a shonen.
It makes a ton of sense Blackbeard WILL surpass Kaido.
As regarding to other players - I can also see them getting amped-up by some story related shenanigans/reveals. It's something I've expected to occur during the final arc.
Something is VERY off with Shanks, I think he might be just so incredibly hax it could make him a massive threat to ordinary brawlers. That being said, he could just be that "hurr durr super powerful Haki buff" character, but that would make him way too boring. This could also bring forth a whole world of possibilities if there's indeed much more complexity/versatility to Haki(which would make a ton of sense). But I'm much more skeptic about this, so I don't have my hopes up in this department.
To add to that - knowing there are potentially other Devil Fruits out there named after Gods that could give one such a massive power boost when awakened also opens up an opportunity to have certain characters surpass Kaido. Who knows, maybe there are forbidden, dangerous methods to FORCE awakening. Maybe Im-sama/Elders possess the power to do so, but will only use it as a last resort on their lackies during the final war. Maybe evn Kizaru(AKA Vegapunk)is currently working on a way to make this a reality. Or maybe Admirals will just awaken it later on, giving them a massive, unheard of boost. Akainu does possess the most potent fruit in the world, after all.
Great/Cursed swords - We're going to have to wait and see what's up with Zoro, but I'm almost certain he'll receive a massive boost from Enma awakening, which seems to be the case. See Cavendish - dude turns into a fucking murderous demon on a whim, his eyes very similar to those of Mihawk and Im-sama. Going by how Enma's behaving, it's definitely possessed by a being. Imagine Zoro receiving a boost that allows him to combine his own power with that of 2(perhaps 3 if cursed swords are also possessed)swords that are potentially possessed.
I have no problem with powercreep in the series. I think it's about time because there's been so much foreshadowed and teased. I think that aside from the horrible mistreatment in the end, Kaido's pretty much played the role of the strongest creature perfectly. It took much more than just Luffy to stop him. By the time he lost to Luffy he was far from being 100%.
Wano being officially the beginning of the end and the dive into the core of the story was a perfect place for him to fall, because this shuffles the deck and symbolizes the beginning of a completely new era started by Luffy and co. so it would make sense this will naturally create a completely new level of fighters that will have to surpass the very strongest. And tbh the era started by Whitebeard's demise had already brought forth plenty of new players with massive potential that is yet to be 100% realized, and the marines probably have their own to compete with it(don't forget the mysterious SSG) . Hard times creates strong men.