I find it difficult to agree with the premise that structuralism replaced existentialism as far as philosophy goes. Structuralism seems a more materialist, naturalist investigation. Structure is a transcendent, ubiquitous concept with myriad circumstances where overlapping structural systems simultaneously present themselves. A given portion of reality may have a plethora of concurrent systems discoverable. Cosmology and quantum mechanics theory paradigms are a prime example. Structure and relationships obviously exist, yet Sartre viewed existence through a rational interpretation ala Descarte, phenomenologically.
Sartre’s view of first-person being; expressed in Being and Nothingness 1943, was expanded into the tome Critique of Dialectical Reason in 1960. In that work he explained how concatenated social experience of groups and semiotics were expressed with serial and ossified praxis, ques etc. Structuralism on the other hand occurred closer to the realm of naive realism anthropology and linguistic theory epistemologically. Like Freud and Jung in search of deep neurological or even genetic reasons for language, thought and social structures, Levi Strauss sought explanations of phenomenology in neurophilosophy. I tend to regard language not as a grand human equivalent of hard-wired bird language structure, instead as lexicons of sound associations-semiotic sets- such as Kripke and Quine regarded in terms of lexicons, ontology and neorealism and/or nominalism.
B.F. Skinner too may have regarded being as primarily deterministic following biological requisites, yet philosophy is more than that-even inclusive of the idea of spirit. French philosophy was heavily influenced by Marxism until Soviet Marxists evolved toward free enterprise. Since then it is just the French and other N.A.T.O. members of Europe pursuing quasi-structured socialism as a religion of war with Russia to force the lost socialist back into a closer relationship with the remaining socialist super-power; China. It is difficult to know if quantum mechanics and cosmology have saturated philosophy so far as to bring skepticism to the effort to find epistemological satisfaction within a secular deterministic model. They do seem to exist at cross purposes to a certain extent.
