The APS Observer has an article interviewing several intro textbook authors, asking them how they think the field has changed. Many commented on the lack of a single theoretical structure, and the way psychologists define themselves with respect to phenomena: 'I study memory' vs. 'I'm a behaviourist'. No one really noted that this was a bad thing: in fact, the multiplicity of 'perspectives' is broadly seen as a strength; these perspectives include evolutionary psychology, positive psychology, etc. (My thought: none of these are theories in the Kuhnian sense.)
Second - I haven't had a chance to read this Glenberg article yet, but the opening paragraph reads
Why is progress slow in psychology? Perhaps it is because there is so little agreement among the content areas (e.g., cognitive psychology, developmental psychology, social, and so on), or perhaps, as Mischel speculates, the drive for individual recognition and theory development precludes a cumulative advance. A third, but related, possibility is that areas do not talk the same language; they do not have the same organizing principles and metaphors, and hence it is difficult to ascertain commonalities in approach, data, and theory.That's about it: no single theory, everyone desperate to have a theory named after them, and Kuhnian incommensurability. Glenberg is going to suggest embodied cognition is the way to unite psychology. but ironically this field is just as fractured and in the same way as psychology in general. New Scientist had an article about embodied cognition just recently but it's about research I wouldn't rate that highly: research showing that things we think about have measurable consequences on our bodies (eg random number generation influencing eye movements, or this rubbish suggesting mental time travel influences posture). I tend to think embodied cognition should entail ecological ideas: consequences for cognition from the type of organism that we are, not the other way round.
Glenberg, A. M. (2010). Embodiment as a unifying perspective for psychology. Cognitive Science. DOI: 10.1002/wcs.55.