Another vote for Jack White, think he's someone who is under appreciated now when he shouldn't be.
Also think that from the world of film that we will be a lot worse off without:
Harrison Ford
Merryl Streep
Steven Speilberg
Helen Mirren
Martin Scorcese
Samuel L Jackson
Clint Eastwood (chair speaking aside)
And many years from now I think we'll all miss:
Benedict Cumberbach
Leonardo Di Caprio
Tom Hanks
Lupita Nyong'o
Idris Elba
Michael Fassbender
Andy Serkis
Jon Stewart
And loads more I'm too tired to list