What if the Red Sox never comeback from 3-0 against the Yankees?
No team had ever come back from an 0-3 defecit in the ALCS before the Red Sox did it to the their arch rival Yankees back in '04. Not a soul thought they could pull it off against the stacked Yankees. Everybody except for the Red Sox. Thy managed to pull of the impossible and took that momentum into a World Series, finally ridding themselves of the Curse of the Bambino.
What could've been: "The Curse of the Bambino" would've been alive and well. They'd definitely have another shot at a title, but they probably would've choked again. Sports are mental as much as they are physical. Everything seemed to go wrong for the Red Sox in the 86-year period. Beating the Yankees was necessary in order for them to excorcise their demons.