That could be how it ends: Wanda has to see Vision die for a third time, complete loses her shit and her power goes out of control, resulting in the Multiverse breaking open. Feige - PBUH!
- has said that WandaVision is the first of a three part story, which continues in No Way Home and concludes in Multiverse of Madness. So Wanda breaks open the Multiverse and spends the next two movies trying to redeem herself and repair the damage by helping Doctor Strange and Spider-Man.
If there was any justice, both Olsen and Hahn would be winning Emmys for their performances, but because it's, "just" a comic book show, that probably won't happen. A damn shame, as both ladies have absolutely killed it. Especially Olsen who can switch from heart-breaking vulnerability and grief to chilling rage
in the same scene. As for Hahn, she rivals OG Loki - before he became an Anti Hero - in her ability to make being Bad look so Good.
Altogether now,
"It was Agatha all along..."