Jonathan Majors Kang the Conqueror is no more... Avengers: The Kang Dynasty is no more... and what did Marvel do... replace Jonathan Majors with Robert Downey, Jr.... replace Kang the Conqueror with Doctor Doom... and rename and rework Avengers: The Kang Dynasty to Avengers: Doomsday... why!?
I was going to do a post about this back in July or August, but I decided to do it now. Both Loki and Ant-Man and the Wasp: Quantumania set up Kang the Conqueror... the trailers for Quantumania said that the film was going to start a "New Dynasty" for the MCU, the post-credits scene of Quantumania showed the Council of Kangs and introduced us to Rama-Tut, Centurion and Immortus... They planned to attack those who tampered with the Sacred Timeline and the Multiverse... At the end of Quantumania, there's a tagline saying that "Kang will return..."
And Marvel just threw all that stuff they set up out the window and decided to no longer have Kang the Conqueror as the main antagonist of the Multiverse Saga and replace him with Fantastic Four villain Doctor Doom as the new main antagonist of the Multiverse Saga... why!?
Marvel doesn't just "build up things and throw them out the window!" They didn't do that with Thanos. Sure, Disney's competitor and Marvel's competitor had initially set up the character that inspired Thanos as the main antagonist of the Marvel Cinematic Universe's rival shared universe before ditching the director's vision of said rival universe and replace that character with who knows what James Gunn has in store with his new rival shared universe. Kang could have been kept if Marvel just re-hired Majors or re-casted Majors like they did with Thanos. All that build-up for nothing.
I've heard on social media that Marvel can basically sideline Kang because in the series finale of Loki Season 2, "Glorious Purpose," the Time Variance Authority begins tracking down variants of He Who Remains aka Kang the Conqueror thus having the TVA handle Rama-Tut, Centurion, Immortus and the Council of Kangs instead. Sure, Marvel can use Kang the Conqueror as the "big bad" of the next MCU saga (speculated to be either the Mutant Saga or the Supernatural Saga) but Kang is a multiversal villain and I'm pretty sure the multiverse won't be heavily featured as it did in the previous saga and probably someone else will fulfill that role. Hopefully Marvel gives Kang another go.
Also, I think Doctor Doom was meant to be introduced in Avengers: Secret Wars as Kang was nowhere to be seen in either the 1984-1985 Secret Wars or 2015-2016 Secret Wars comics.