Secret Invasion is poised to become the most impactful MCU Disney+ series by bringing an end to the era of the Avengers. Although Marvel Studios has revealed very little about the upcoming series, which is slated to release in spring 2023, its title and comic book source material imply that it will be a vital chapter in the ongoing storyline of the MCU. Much like the original 2008 comic book storyline on which Secret Invasion is based, the upcoming Disney+ show may be sowing the seeds for the end of the Avengers as Earth's Mightiest Heroes are replaced with a newer, far darker team.
https://screenrant.com/secret-invasion-end-replace-avengers-team-theory/