I'm disappointed too. If I recall correctly, Cinera said if King is really defeated next chapter, he will take another long OP break. I think I'm going with him this time..
Actually, what I always wished every single arc, the opposite happened.
In PH, I wish Monet join. Reality: she died.
In Dressrosa, I wish Rebecca would eat Mera Mera and she joined (she looked strong in her debut). Reality: she is a crybaby.
In Zou and WCI, I wish Pedro would join. Reality: he died.
At beginning of WCI arc, I also wish that arc would be simply short arc of getting Sanji back, and Luffy would never defeat Cracker or any Sweet Commander. Reality: he beat not only one, but two, and 1 of them is the strongest SC.
In Wano, after seeing Katakuri set the standard high in WCI arc, I kept my expectation high for King.
Reality: his battle got very rushed.
Next, I wish Yamao will join, and following the formula, I can see the ship will sink soon too.