I think Dolores, in the original Arnold timeline, finds sentience and life too painful, gets angry, and "saves" the others from that pain by mowing them down Wyatt style - Killing Arnold, aka the seated General, last. Don't have a similar wild ass guess as to how the William/Dolores timeline ends, but we know Dolores once got to the center of the maze and that the MIB says he "saved" the park back in the day. Not sure if that meant financially or by covering something up from the William/Dolores center-of-maze ending. I would guess the older timelines are wrapped up in finale and the "present" is the only one continued in next season, but all wild all guesses.