Maybe, maybe not. Winning the war at sea post-Midway wasn't the challenge, it was the brutal ground warfare.
Speaking of Midway, one of the generally forgotten side stories involved the Japanese wanting to make a feint at the Aleutian islands in order to get the American fleet up there while the invasion of Midway took place unopposed. With the codes broken, Nimitz told Fuzzy Theobald to take a fleet of surface ships up to an exact point to repel the Aleutian invastion. Theobald took the ships and put them about 600 miles away, way away from the battle, and Japan took two islands unopposed. A year later, it was decided to retake those islands, and it cost America 1,500 men and over 200 planes to get it done. And these were for two strategically unimportant islands, but it was held onto until the bitter end by Japan (losing over 50% of their men).
Besides, naval warfare at that point was still very much a theoretical. Coral Sea was the first naval battle where neither side actually saw the other, and that was in May of 1942.
