Does that culture really matter if very little out of 40000 years is remembered or recorded?40 000 years of culture that out lasted empires the likes of Rome makes your supposition null and void. Perhaps you need to re calibrate your ideas on what an effective society must look like.
How about becoming an interstellar race isn't that evolutionAgain, it's how you wish to view modern western cultures. I wouldn't call the worship of celebrities evolving or stripping of the earth natural resources including the oceans evolving or high rates of suicide and depression evolving etc etc.