Strangely, as much as I like Gaugin' formulation, I don't have any romantic views of early humans living as savages. I don't really know how Gaugin thought about human origins and progress, but I do believe that ancient peoples, such as the Egyptians, were extremely sophisticated. I think that it would be a mistake to see our civilisations as being 'superior'.
If anything, I take the view that, despite our findings about early civilisations through archaeological studies, it is extremely difficult to step into the worldview of the earliest people. I am familiar with Julian Jaynes' 'The Origins of the Bicameral Mind' and see this as pointing to the possibility that early human beings' mental processing may have differed from that of humanity now.
In thinking of the future, it is so hard to know where we are going, and on what scale human beings will survive. Will we destroy ourselves on a mass scale through war and exploitation of the environment. It could be that devastation occurs on some level, with pockets of humanity surviving. As for what these human beings may be like, it is hard to know. Will they live beyond the lifespans of the current people, benefiting from the movement of transhumanism or not?
I am sure that 100 years ago people would not have necessarily envisioned life as it is today, in its diversity. So, it is extremely difficult to know what the future has in store for humans, and what life may be like within different parts of the world in about 100 or 200 years time. It feels strange saying this, because we can look back on centuries of history, with the varied developments, but if we think about life since the first and second world war, it seems that changes have been so dramatic and accelerated. It makes it hard to know what will happen in the future, and whether progress will simply continue at the rate it has within the last century.
I fear that we are at the end of civilisation as we know it, but I hope that is just my own fear. For all we know, there could be a whole panaroma of history awaiting us, although my own intuition is that we are the end of some kind of cycle.
Despite having written about history and the future, I am not certain that Gaugin's statement was meant in just this way. I feel that he may also have been thinking about how individuals find themselves and view themselves in relation to the world, and historically. In this way, his three questions are more about our own significance in the grand scheme of life.