Bourgeois philosophy has withered on the vine. It has nothing new or meaningful to say. For that very reason, it is justly subject to universal contempt, or, more accurately, indifference. Here again the baneful effects of the extreme division of labour make themselves felt with a vengeance. Isolated in their ivory towers, the academics pass their lives writing obscure theses which are read, and sometimes answered, by other academics.
Few people understand what they write.
Let us take Existentialism. Existentialism has its roots in the irrationalist trend of 19th century philosophy, typified by Nietzsche and Kierkegaard. It has assumed the most varied forms and political colouring. Existentialism centres everything on the moment. All that you can achieve is in the moment in which you are living and anything before or after becomes irrelevant.