My friends and I were discussing this at the game yesterday and we concluded that the reasonable replacement for Hawk would be a Hawk Robot. All you have to do is program all the stories, catch phrases, and "Yaz" drops in and no one would even know he was gone.
Maybe that speaks to the kind of caricature he has become.
"Everyone, welcome to the Duff book of world records! Springfield is the world's fattest town!"
"WOO HOO! In your face Milwaukee!"