So it seems there is a chance the world could return to normality but would they preserve the memories of it? A non-infected brain without communication through frequencies could not retain all that information so will they be left damaged by it, remember everything, back to their individual memories before the hive? CAN they remember life during the hive?
How different and essential to humanity the 12th non-infected can become? they have linear memory of the events and their bodies never got sick from the virus so they are a reliable source of information.
Also totally wild take but if people preserve the knowledge after the undoing that means that somehow they will stay forever different from the 12 unaffected, they will retain traits of the hive and probably life on earth will never go back to like it was. ALSO if is that beautiful they might wanna go back to being infected!! like Zosia said it only gets better.