And, as you suggest a little further down in your post, TPTB are as vulnerable to primal fears as anyone else. Fear dictating taste? Perhaps.
But, as you said, we might shift to a new Dark Age mentality and hunker down, and our monuments might reflect that. Fortresses and bunkers.
Actually I was thinking about the zeitgeist of the 21st century. The 20th was dominated by the phallus; The Eiffel Tower, the skyscrapers, Freud. My idea was that perhaps the 21st would be dominated by the oomphalos, the attachment to the mother. Or perhaps you are correct; and all this has made me want to assume a fetal position!! ; Perfectly understandable.
All through architectural history we have had our ups and downs, depending on our overall outlook. At this moment, a sense of security appears to be the prevailing idea that will influence the new style
What can you foresee? I rather like the idea of rubber buildings fortified with crushed glass myself.