a better translation for the expression "psychology is dead"
Friedrich Nietzsche: "Gott ist tot."


Well-known translation: 上帝已死。


  Stephen Hawking: "Philosophy is dead."


Well-known translation: 哲学已死。

Thus I believe the best translation for "Psychology is dead" should be 心理学已死。

PS: Of course, without context, one might hardly understand the meaning, but any other translation won't do either. So an idiom-like expression fits.