User blog comment:STO12/STO12's Predictions for SSB4/@comment-5293798-20140201202544/@comment-4798275-20140202055418

The only problems this time around is that there is limited room. Unlike Melee and Brawl which had rosters larger than their predecessors, Sakurai stated there would be the same number of characters as Brawl for SSB4. So with the room needed for newcomers and popular veterans, R.O.B. is likely discontinued.