I came across this wonderful summary of the current and probably future state of clinical psychology on Paul Lutus' web site:
Clinical psychology has evolved into a loose collection of fads whose popularity varies with public taste rather than scientific evidence
That's about what it is. Without the means scientifically measure of the efficacy of treatments, clinical psychology simply serves up what it's customers demand. And these days, it's usually CBT.
The problem with psychology, and clinical psychology in particular, is that it is more guided by social and political influence than it is by science.