> if we sustained a 1% annual population growth for another 13000 years

And if we sustained a 0.03% annual population reduction rate (like South Korea recently experienced) there would be less than 100 people on Earth after just 600 years.

So I agree that exponentials can get away from you a lot faster than you might expect, but I also think that trying to predict cultural norms 13 millennia from now is likely to be counter-productive.