If the original cast doesn't come back the movie won't work its not how it works in the 1st 2 movies Chris Pratt is Emmet and Elizabeth Banks is Lucy/Wyldstyle they brought Emmet and Wyldstyle to life or the 3rd movie won't work same with Will Arnett as batman or Will Ferrell as President Business have a new cast won't be the same and fans will hate it and be mad they love the original cast so please don't let the fans down and keep the original cast fans need to hear the characters needed their original voices