You know, the more I think about this, I'll go one better & say that if I were the Duffers, I'd be pushing to get a Stranger Things major motion picture cinema franchise... right. now.
And what I mean by that, is that instead of how the show is a period piece set in the 80s, it would be set right now, with flashbacks to the era when they were kids, setting up the events that will be resolved in the movie(s). So you'd cast older versions of the younger cast, & the premise would be that they are still fighting the fight, so many years later, & the twist would be that the upsidedown isn't an alternate dimensional plane at all, but rather the future, a future where they've seen the world ravaged by the Mindflayer… but in context... it's our present day, & that's how the movie would begin. Fade in to a time stamp heading "Present Day", & they are living in the Upsidedown now
You could call the movie Stranger Things Now. However, I'd want them all to be badasses, seeing how they'd have been fighting it all of their lives. So yeah, Dustin would be Jason Momoa. Will could be Jake Gyllenhaal, Lucas could be Idris Elba & Mike could be Adrien Brody. Maybe Kate Beckinsale or Natalie Portman for Eleven or something... & you know take it up a notch! Go big or go home lol