No, Ripper, you don't get it. It's already an urban show: it takes place in shitty 70s Brooklyn. Part of the premise was the racial mixture; if everyone's black, that's lost. You're gonna have to change all the characters, because there aren't going to be any black guys named Vinnie Barbarino. And if you don't have "Juan Epstein, the Puerto Rican Jew," then it's not even Welcome Back Kotter. It's just a film very similar to the 70s hit sitcom "Welcome Back Kotter" in which a teacher goes back to the ghetto school he graduated from. Just call it "I Done Come Back Up In This Bitch" or something
I laughed really, really hard at this. "The Wiz," for the record.
Oh by the way, Sanford and Son is a black remake of a white show: like a bunch of Norman Lear shows, it started in the UK. Sanford was played by Paul McCartney's very clean grandfather from A Hard Day's Night