She's been Oracle for 20 years(so maybe 8 years in comic time), why get rid of that? She's separated herself from the Bat name, why put her there again? She's a grown woman, why call her 'girl'? It just seems ridiculous and pushes Cass out of the way, who's been a better Batgirl than Babs ever was.
Now if it's a look at the past, I can accept it though with what DC's been saying lately I'm not so sure it is.