I'm not a psychologist, but a philosopher, well versed in German Idealism -- the branch of philosophy which Freudian psychology stems from. And, as Hegel would tell you (that's if you don't find him too "dated"), a dated, or incorrect, theory is valuable in as much as it supplies the point from which the ideas that follow it depart from. The so-called relevant ideas of today will soon become "irrelevant" tomorrow, but not before providing us with something to supplant them. What is more, there is often a return to these ideas. If we trace the path of epistemological history, which can be divided into two camps, rationalism and empiricism, we have seen one give rise to the other and vice versa: for example, the intuitive beginnings of the enlightenment gave way to the empirical leanings of the natural sciences, culminating in Russell and Whitehead's Principia Mathematica, before Gödel's On Principia Mathematica and Related Mathematical Systems marked a revival of rationalism.