DFG replacement?

I think we need to rebuild the trinity of end game +120 AP item. Zhonia is for defensive purpose. Deathcap is for offensive purpose. Why dont we have an item that gives +120 AP and 20% cdr as an end game utility AP item? I find myself slot contrained when im gearing for a 40%cdr build without the dfg right now, and while the removal of dfg might serve a purpose to lessen assassin a bit, they also remove some of the precious source of cdr, particularly late game cdr, int he game, and an end game +120 ap 20%cdr item would greatly benefit utility/dps mages.