What if Nor and his gang arrive during the mayoral debate or shortly (days) thereafter... before Lois leaves perhaps? Zara and Ching have found Kal-El, whether or not he's a worthy ruler has no merit with Nor... who would want him dead in either case. If Nor and his gang barge into the mayoral debate (or Zara and Ching kill Tempus for hurting Kal-El -- using heat vision from a distance) both Tempus's prophecy and Kal-El's ruin would go hand in hand. Ironic, huh?
If the time machine is damaged (or Wells killed / injured in the process), Lois could get stuck in this sucky alt-dimension with no way to return home and Kal-El leaving because she essentially ruined his life by making him into Superman (Not that Alt-Clark would believe this, but he couldn't remain on this planet now that human think he had come to invade, but he also wouldn't want to leave being that he found Lois... even if she wasn't HIS Lois).
