Still, other than Morrison, John's name is still one of the best ways to draw attention to an IP, and also ensure that a large number of the current comic buying audience actually
care about whatever IP and the attention they're receiving.
Unless your name is Superman, Batman, Spider-Man, Wolverine, Deadpool, or X-Men, a book will have serious troubles selling to the current audience without a big-name or superstar creator attached.
Note, that I didn't include Wonder Woman, because even she struggles with this.
"Castrate" Cyborg?
You're saying that Johns is going to "castrate" Milestone characters?