In my minority opinion, Roger Ebert will be missed more as a human being than as a writer. As a film critic, he was facile, energetic, and ambitious--all admirable qualities, but did he once write a review that helped me to see a film through eyes different than my own? No. I can't recall learning anything from a Roger Ebert review I didn't already know, and I can't recall being persuaded to see a film that wasn't already on my agenda to see.
(Insightful critics who can tell us things we don't already know, and help us see with new eyes, do live among us. In the realm of film, I'll offer up Dave Kehr.)
However, the courage with which Ebert faced his travails, and his determination to continue his life's work to the fullest despite them, were inspiring. They are his true legacy, along with the way he improved (from all accounts) the lives of those who knew him.