God doesn't need to think about it. He knows all, sees all that was and will be for all time. If we accept the reset button on humanity after The Flood and, arguably, again with Christ's Resurrection to happen for the last time with the Second Coming... what are we talking about here?
As you said, God knows what will be. Why would He wipe out people that He knows are going to do stuff that will just require His wiping them out again?