My prediction for how it'll end
I know it probably sounds crappy, but this popped in my head - What if Sidney makes a drastic decision and decides to kill herself at the end in order to stop the Ghostface epidemic once and for all? Her rationale is that as long as she's alive, this will never end. People's lives will always be in danger, and maybe the way to end it for good is for her to finally die. So after the killer(s) have been dealt with, she picks up their knife and plunges it into her chest or stomach and dies alongside them. The final shot of her is an overhead shot of her lying dead next to the Ghostface costume laid out on the floor, very symbolic
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