The way I see it, Eternals was a hint of what could happen if Marvel missed the mark, but then they salvaged themselves with NWH and MOM back to back. MOM treaded a bit into mixed territory but it was mostly well received, then Love and Thunder shit the bed afterwards in terms of quality and really was only saved because of audience good will for Thor. Wakanda Forever then showed people the MCU could still deliver and brought a lot of goodwill back, Ant-Man 3 trailers looked good and people were hyped seemed like people were ready to forgive LAT and Eternals hence the good OW, and imo that opening weekend was the moment Marvel lost the audience's good will. It was a case of people actually did show up and Marvel just shit the bed, if they had nailed that one film imo we would be in a very different position in terms of audience goodwill. It brought light to all the wackyness and worst parts of Phase 4 that before people were ready to forget if Marvel had delivered. In a universe where Quantumania was good and setup Kang well, i think Gotg Vol.3 could've made a Billion, The Marvels could've atleast made $500M we'd be going into 2024 with amazing momentum.
And now we're at a pivotal situation again, the audience is ready to give Marvel one last chance based on past trust of Deapdool and Logan, and Guardians 3 delivering. And I think if they do deliver, they have a pretty good 2025 lineup to build up positive momentum again