Regarding A24 and their properties, something I have heard from some industry friends (people who work with producers and creative developers) but can’t confirm personally is that they give a lot of ownership/control to the filmmakers. Like, an insane amount. They’re allowed final say on more or less everything. (Final cut, trailers, home video model, repertory access, etc.). It’s a big part of A24’s strategy of attracting indie filmmakers, keeping them away from both the big studios (where basically nobody except gets that treatment) and the smaller studios (Neon, IFC, The Orchard, etc.), where they’d get far less exposure.
Anyway, tl;dr, I would put movies like Hereditary, the Witch, and Midsommar on the “no chance” list because Ari Aster and Robert Eggers see themselves as Very Serious Artists
who, by their own admission, aren’t really even horror fans in the first place. They have no interest in an event like HHN.