Leg 5 toward 3400, then what?

looks like we are in a leg 5 up of a 12345 EW living within a bear flag this last 1.5 months. I am looking for a significant correction after this last exhaustive move up toward 3400. I think it shoots for ATH (which has been the goal since mid-may), then we could see 400-1400 point drop. The drop may not come all at once and will most likely play out over a 4-6 time frame in EWs.