I agree with Le Rough that if they had not become extinct their would probably be a new species. What would be different? It would be really hard to tell but I theorize that this new species would have evolved technologically liked the Cro-Magnons, as for how society would look I don't think it is possible to predict.
"If there is a State, then there is domination, and in turn, there is slavery. " - Mikhail Bakunin
"The oppressed are allowed once every few years to decide which particular representatives of the oppressing class are to represent and repress them. " - Karl Marx
“Anarchism, really stands for the liberation of the human mind from the dominion of religion; the liberation of the human body from the dominion of property; liberation from the shackles and restraint of government.” - Emma Goldman