I hate to answer so bluntly, but effectively, no. The invasion of Normandy was planned and prepared, to one degree or another, for well over a year, growing in scale from an initially more modest proposal. The materiel and troops assembled for it were enormous; a catastrophic failure would have delayed any future invasion of northern France by months, if it occurred at all. It's possible that an invasion of southern France, as happened historically in Operation Dragoon, might have been made instead, but as they would be facing an undistracted German army, it probably would have had to be made larger in scale, and thus delayed considerably from its historical timeframe.

Eisenhower drafted a letter of resignation to be delivered to Roosevelt if the landings failed.