Yeah, the Loki series should be really interesting. But I do think it could be Tom Hiddleston's last hurrah as well. If not, I think Thor: Love & Thunder will be it for him. Not sure about Chris Hemsworth. I think he could be saying goodbye after Thor: Love & Thunder as well. You certainly get the feeling that the old guard is gradually departing from the MCU with Hawkeye, War Machine, Hulk, Nick Fury and the Vision bowing out in the not too distant future (I can even see Ant-Man retiring after the conclusion of his trilogy as well).
I agree with your analysis on Vision and Quicksilver. My personal preference is to see them return because I love the characters. However, it would make life a little too perfect for Wanda. Then her losses wouldn't have meant anything. She would be like a literal goddess and I don't think fans would like that. I am also in agreement with you in regards to the whole magical pregnancy thing. For Wanda to create her kids through magic might be a bridge too far for television viewers. If she wants to have twins, in all seriousness, she should get a sperm donor. Maury can worry about who the daddy is later. That is something audiences can get behind. I actually think the twins WILL survive the show because Marvel is clearly building up the Young Avengers for the future. I'm just curious if they will appear in the Multiverse of Madness with Wanda.
I think it's very possible Vision WILL temporarily be revived during the series. Wandavision director Matt Shakman stated that: "I think we've all been quite taken by that union. It's [WandaVision] is the exploration of that bizarre, strange, completely right kind of love and it's about watching them explore their relationship and growing it." And Paul Bettany said “I think there’s been a real progression in the characters and the relationship and to actually be able to spend the time on that. Each time there’s more exciting stuff for us to do.… The scripts we are reading so far are so bonkers.” Kevin Feige chimed in by saying that WandaVision will "further explore who Vision is." That doesn't sound like Wanda, Chthon and/or Nightmare are going to be creating a "fake" version of Vision to me. Bettany claimed that being in Wandavision is one of the highlights of his career, so I can't imagine Vision is going to be not real. My personal view is that Vision is going to be thrilled to have a wife and kids in this fake reality (something he has always wanted), but will eventually realize that this situation is causing Wanda pain. And he will sacrifice himself to protect his family. But that's just a guess. I can't imagine Marvel Studios will make him stand by while Wanda is suffering. That just totally goes against his character. I really hope they don't go the reincarnation route for the kids. It's just too convoluted and confusing. Make Wanda's kids HERS biologically.