Psychology as a Science

I believe that it is very interesting that many of the Schools of Psychology, when they first emerge, claim that they are attempting to shape Psychology as a science, and look at those schools before them as inadequately unscientific.  Behaviorism stands out though, among the schools of psychology in the zeal it showed in proclaiming itself as a “pure” science.  Watson especially was considered excessive in reducing everything to behavior.  I remember how in the book, it tells that when Watson attempted to explain thought and speech as a behavior, he met with criticism from all sides.  And that, though Watson could not explain either thought or speech in terms of behavior  satisfactorily, he remained adamant in keeping behavior as the only way to explain humans psychologically.

I question as to whether or not behaviorism will continue to be a major school of psychology in the future.  Or, if like  gestalt psychology, it will simply become a supporting wing of psychology to the increasingly popular biological model.  Neurology/psychiatry and neuropsychology are becoming increasingly intertwined, and despite Watson’s prediction, are becoming increasingly more able to explain psychology in terms of biological processes.  However, even the biological model cannot explain everything.  As far, behaviorism has its niche and can explain many but not all psychological aspects of humans, and as it cannot explain the mind, has become more and more connected with cognitive psychology

So, I wonder in the future whether psychology, like physics, will search for a unifying theory.  Or will it remain a fractured science, in which collaboration between the branches in the only way to explain human beings?