Bring back (only if done properly):
Hero Factory (this or Bionicle, at least some CCBS line)
Harry Potter (or Fantastic Beasts sets, whatever the new wizard movies are going to be called)
Bionicle (make it matter this time)
Orient Expedition (which would encompass elements of Atlantis, as well as Indiana Jones, this may be the third large system franchise if they manage to make it interesting)
Star War....nah, its definitely Architecture.That overpriced pretentious mess of a theme needs at the very least a reboot....or at the worst scrap it something worth the money.