I don't know about this. It's a film franchise, not a TV show.
I know, and I am not saying it should always be done for every movie in the reboot, just certain stories and characters.
And there are different degrees of Cliff Hanger endings. Minor ones that simply hint at what is to come (ala BB with the Joker), or how they could of ended SM3 with the birth of Venom.
Cliff hanger endings have been used very successfully in other movies too, like Star Wars.

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