Listen, do I love a good sad ending? Yes, a tragedy, a bittersweet ending, a well written horror, villains winning, heroes losing, you know, all that edgy stuff. I don't believe everything needs to have a happy ending and I think for some stories, a tragic ending just makes more sense. I also love when writers go against the viewer's expectations because it's interesting and can really be impactful if done well. However, I still need Stranger Things to have the happiest, cheesiest, sweetest ending of all time.
No one is allowed to die besides Vecna and some demogorgons. They kill Vecna with the power of love and friendship. The world is saved. Everyone gets their happy ending whatever that may be and no matter what, they all stay friends because they are basically family at this point. Bonus points, if the last scene is everyone hanging out and everyone just being happy. I won't even cringe if the last line is one of them saying "well, we've definitely seen stranger things."
Like make it goofy and funny and sweet, the rest of the season can still be dark and serious without there being any more tragedy. I don't think the ending being happy will take away from that.
I know this has probably already been said but it's so important to me that the show isn't a tragedy. You know why? Because it's a mainstream show about outcasts in the 80s. A show about gay kids, black kids, disabled kids, kids that are considered different just for existing. If you take away the supernatural and the sci-fi elements, at its core, that's what the show is about.
So if the show that from day one has been about being different and being who you are, turns around and kills off half the cast and has either a bittersweet ending or just a plain awful ending just for shock value or because it makes the story more "realistic" (and yes, that includes having Will be rejected by the person he loves and being killed off. El sacrificing herself because she's a superhero and that's what she feels she's supposed to do or Max and Lucas having a tragic love story.) It'd be throwing away everything the show stands for and personally, I think it would be god awful writing.
That kind of ending can be done well but I don't think that's the kind of ending ST needs.
There's been enough tragic stories about minorities in both the past and present. This show has evil crispy undead wizards and giant lanky mind controlling spiders, I don't think poc/queer/disabled/female/etc characters being happy and alive is gonna make the show unrealistic.