I would consider it as well if I were them. The Mile can always be won by any good horse. Its a race where the trip is the key to the whole thing, you get 12-14 horses trying to go around two turns in tight quarters and you are always going to need tremendous luck in order to win.
I guess they have to consider whether or not they wanna go there and skip the Hollywood derby, or just go to Hollywood where they would be heavily favored in a big purse. As sharp as Showing Up is right now, I really would think running him in the mile would be a good idea.