Not defending that guy's poor argument, but if you check the pre-orders for the game I doubt they are lofty.
EDIT: Just picked this from Amazon http://www.amazon.com/best-sellers-video-games/zgbs/videogames/ref=pd_dp_ts_vg_1 No sign of All Stars, in fact it's around #600. Not a great sign.
Good lord people... Superbot themselves have confirmed that the 20 characters that have been revealed are the final roster. Just accept it before you set yourself up for disappointment.