Sorry - no bigger blog post, but I wanted to keep my microseries going.
What If Snape had actually tried to protect the Sorcerer's Stone instead of writing a word problem, and put poison in all seven vials? Hermione's dead, victim of her own faith in the educational system. Harry is stuck in the room or dead if he tries another vial, but ... Quirrell/Voldemort probably keep trying to decipher the Mirror of Erised until Dumbledore returns, and that could give Dumbledore the chance to capture/destroy Voldemort at his leisure. If Harry survives, he becomes just a rule-breaking know-it-all with no Impending Doom excuses for his misbehavior, and probably ends up the attendant on the Knight Bus, telling everyone that he's just waiting for his Prophecy to come true.