Free software wouldn't even exist as a movement if it weren't for Stallman. Linux and *BSD wouldn't exist. Emacs and gcc wouldn't exist. Stallman is the FSF and they're irrelevant without him.
So will the FSF just cease operations when he dies?
"So I asked Bostic himself. Originally, his reply was: 'It’s true. John Gillmore & Richard Stallman convinced me that opening up the sources was worthwhile, we wouldn’t have done that without their urging.'"