Good question. So Rita Moreno is still in sterling health as the One Day at a Time reboot shows (best fixed-camera sitcom since the genre's golden days?) and Mel Brooks could make 100, so we could be looking at the health-issued ALW or Whoopi going first. As for the one-off-an-EGOTters.... Cher is one off, needing a Tony to complete the quartet, and a jukebox musical based on her songs will be eligible for the 2019 Tonys....