@BlueChicken,
It may not be that Existentialism as such is dead, or even that its place in academe has been surpassed by other trends, but that Existentialism, or some of its major positions, has become the foundation for newer trends. Certainly Nietzsche and Heidegger have rather directly influenced modern phenomenological trends, for example the investigations into what is described as the "life-world" not to mention Derridas, Levinas, or Gadamer.
Much of the current interest in Hermeneuticsis is being done by second- and third-generation "existentialists." On another front, the women's liberation movement continues to draw on the Existentialist arguments propounded by deBeauvoir in her "The Second Sex."
The shift made by the Existentialists from epistemology to ontology as the starting place for philosophical analysis, the emphasis on the individual in situation (being-in-the-world), the questioning of traditional dualisms, and the desire for flexibility in method seem to have infused contemporary thinking.
Since Existentialism was never a
coherent movement in philosophy, but rather a group of thinkers with certain "family resemblances" loosely grouped together,then---in that sense of a defined position (neo-Thomism comes to mind)---one should not expect "Existentialism" to endure. I would conclude that many of the current "names" in philosophy do work within an 'Existential' framework, or perspective, as I have described, but have branched off into new areas of interest.