Thinking it over, I’m now convinced that the TVA will play a part in “Avengers: Doomed” (what I call the “Doomdsay” + “Secret Wars” two-parter), as Feige can’t just throw the entire Multiverse story arc outta the window.
So, the whole Multiverse and TVA story will still happen, only with Downey Jr.’s Doctor Doom behind it rather than Kang.
Well, considering Disney/Marvel also got the Russo brothers, who directed Captain America: The Winter Soldier and Civil War, as well as Avengers: Infinity War and Endgame, to return alongside Robert Downey Jr., I’d say let’s just wait and see what happens.
After all, people were also skeptical about Ben Schwartz playing Sonic and Chris Pratt playing Mario, and we all know what happened with them.
Edited
The actual answer? No idea. My theory, they started second guessing going with Kang as the next big bad of the major arcs.