Interesting. Haven’t really thought about it much in that way. I believe much of the fighting would be fierce like much of the other fighting in the Pacific Theater. The US plan was to hold the island. That would mean drawing the battle out into a siege. The Japanese plan was to take the island by force with the airfield mostly intact. In the US favor was the size of the marine garrison and stock pile and the fact the Japanese wanted the airfield to use. In the Japanese favor was the size, preparation, terrain, and lack of size of the Midway Atoll. Sand Island is a little over 2 miles long with Spit Island and Eastern Island being smaller.
If the sea and air battle had be fought to a draw or slightly in favor of the Japanese, the Americans would have drawn out the battle by night fighting and blockade running to resupply the island. The Japanese would have eventually won.
If the sea and air battle had been truly dominated by the Japanese (as in as bad as the Japan lost in history), the Americans would have drawn out the battle and force the Japanese to use their reserves within the landing force. The Americans loose to overwhelming force and would not receive resupply. Surrender comes eventually.
The Americans would have used the time that Midway bought to repair the aircraft carriers that were historically not ready for the Battle of Midway. They would of also prepared Hawaii for invasion. Honolulu is only only 1313 miles away. Makes you think of how big the Pacific really is!