The big worry, too, is that with a seriously weakened fighting force and the utter chaos in Japan that the invasion would’ve brought, the Soviets would’ve just sauntered in and taken over to establish another Communist state. In turn, there would’ve been no way for us to have challenged the situation in Korea shortly after, either. The entirety of Asia would’ve fallen like dominoes to the forces of darkness.
That’s a good point, the Soviets would have entered the war against Japan and even though they did, they only managed to get a few small islands. Had there not been the bombings, most likely, you’d have a “North/South Japan” situation where the Soviets would at least get Hokkaido if not half of Honsu at least and instead of the Korean War, it could have been the “Japanese War” or even both.