And the Allies march to Berlin within the year. The Heer fell for Patton's ruse and would have placed the reserves in anticipation for a landing at Calais. They would have been out of position both physically and more importanly psychologically. What's more, German field divisions had more horses than trucks. The Allies landed more trucks than Germany had in their defences.
As such, the opposed landings gave Germany the time they needed to fortify the Schelt and to maneuver their reserves, at the very least to save them. The Schelt delayed allied efforts to have a fully functional port.
I can see the Normandy landings being unopposed to have the same effect as Inchon.