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This articulates so many of my thoughts! This rushed ending really made me wonder what might be going on behind the scenes.... I don't know much about the industry and don't want to speculate too much, but I found it weird that he had a hiatus and then the ending came so soon....
I really don't know what to expect from the ending and maybe that's better, going in without clear expectations....
I guess I'll have to wait....
Honestly, considering how Gege is treating JJK in interviews and talks about it and the characters i also doubt he will continue it
Again, JJK as we know it now is NOT what Gege intended for it to be
He changed a lot of things to please a editor of his and ended up with a complete different story and had to adapt characters to fit the new concept
Yeah, I know those interviews where he wasn't pleased with his first editor he had right before the JJK serialization and at the start of it. He did have to change many things because that editor didn't think his original ideas would work. In a recent Q&A he talked again about the changes JJK went through at the beginning before the current characters and storylines were ultimately decided on.
Those original ideas included having Megumi as the main protagonist, him being possessed by Sukuna, the story starting with a Culling Game like setting and other things.
To say though, that because Gege didn't/couldn't start his manga like he wanted to means he would be glad when it's finally over now... that sounds a little ridiculous. It's like saying Gege doesn't have ownership or love for his own story and chaarcters and that's... not something that I ever got the impression of.
In his last interview he talked openly about how he changed things to make the story work better. A bad editor at the time of course would've soured that process but with a good editor changes like that would've happened anyway. Look eg at the original concept of Demon Slayer.
And in the end, Gege still got to implement the ideas he had. Megumi still got possessed. The Culling Games were realized. From what I remember, the things Gege regretted in the story are bad buildups and that he didn't manage to have Yuji and the real Tsumiki meet once.
On that note, if we go with "he couldn't write the story he wanted to", a JJK Part 2 would actually be something he could look forward to in that regard. Starting everything with a fresh chapter 1 with editors he actually gets along with, he can write the story as he actually envisons it. I guess, but I have no idea about the actual industry machinations here, that he could negotiate better pay and the like for himself as well.
Of course that doesn't mean JJK 2 is guaranteed or something. Gege could love his story to bits and still not make more of it but ultimately we'll see that next week (or next year if we look at other manga that got a sequel where they waited some time before anouncing anything)