I don't really disagree with the point he's trying to make there, and if we restrict ourselves to talking about post-Enlightenment Western cultures the argument might be largely accurate; but over all cultures in all times and places he's simply wrong.

It's actually fairly unusual for a culture to be consistently forward-looking at all, let alone to assume that the solutions to all its problems and the answers to all its open questions will arrive in a few years or decades. Most seem to have assumed that the present world's unusually debased and that things will only get worse, usually culminating in some sort of cataclysm; compare Hesiod's Ages of Man, the Kali Yuga, et cetera. This sort of thing might seem like a reactionary fantasy to us here and now, but that or a cyclical viewpoint or some combination are part of the bedrock of myth in essentially all the traditional cultures I know anything about.