Why are people acting like the MCU is on its last legs, and hiring the Russos is some desperate measure? Black Widow probably under performed but it released during the height of the pandemic, same with Shang-Chi (although it seems to have atleast doubled its budget even as a pandemic release) and Eternals (which got bad reviews and was a pandemic release). By Spider-Man: No Way Home people were getting past the pandemic (well they were starting to ignore it more, I don't think it ever really ended) and it made over 1.9 billion dollars, Multiverse of Madness made almost a Billion dollars without even playing in China, and BP2 and Thor 4 both had a box office over triple their budgets. GotG 3 also tripled their budget with thweir box office, and all of this is not even taking into account things like merchandise, etc, which is probably bringing Disney money even from weaker films.
The MCU has ONE recent film that was definitely not profitable (The Marvels) and one that maybe only broke even (Quantumania). Every other (post pandemic) MCU film since Endgame has done ok to amazing. One can argue that some of the Disney+ shows have been awful, but they're not really the part of the MCU that determines its overall success, thats pretty obviously the films. Secret Invasion sucking or She-Hulk being mediocre doesn't change the fact that the movies are still mostly very profitable. The MCU is at the point where not everything they do is guarenteed to be successful, but they're still successful the majority of the time and still popular with the general audience (a group that isn't usually online so they're not heard as much as the loud MCU haters).