This I agree with.. if a player has clearly expressed that he has retired, needs to be taken from rankings, it is unfair they just hog a spot for no reason. Roddick is retired, why just keep him there without reason, ATP should let a player sign a waiver or something saying he is retired, so he can be removed from active ranking list.
Although it's a stupid article, I DO think that the ATP needs to actively remove players from the rankings once they've expressed no desire to play anymore. I get why they don't remove players (because they don't "add" players), but they need to. It just makes more sense, IMO.