Oh thank you! I didn't know that. Sometimes it's hard to believe how many lucky mishaps conspired to create the TNG era verion of Trek. Very interesting!I seriously doubt Gene would have come up with the bumpy head look for the Klingons if things had gone differently. In the real world the failure of the Genesis II pilot resulted in the Planet Earth pilot, which featured very familiar spine-headed looking guys called the Kreeg . I'm betting it was the Kreeg which in part inspired the TMP Klingons, in which case no Planet Earth = no idea for bumpy headed Klingons.
However I still doubt that Roddenberry would have been "laughed out of the room" had he proposed to change the appearance of the Klingons. TV producers do not care for continuity, they care for what looks impressive and what sells well. In this and any other timeline.