Was Wittgenstein Right?

NYU professor Paul Horwich writes in the NY Times:

The singular achievement of the controversial early 20th century philosopher Ludwig Wittgenstein was to have discerned the true nature of Western philosophy — what is special about its problems, where they come from, how they should and should not be addressed, and what can and cannot be accomplished by grappling with them. The uniquely insightful answers provided to these meta-questions are what give his treatments of specific issues within the subject — concerning language, experience, knowledge, mathematics, art and religion among them — a power of illumination that cannot be found in the work of others. ...

Wittgenstein claims that there are no realms of phenomena whose study is the special business of a philosopher, and about which he or she should devise profound a priori theories and sophisticated supporting arguments. There are no startling discoveries to be made of facts, not open to the methods of science, yet accessible “from the armchair” through some blend of intuition, pure reason and conceptual analysis. Indeed the whole idea of a subject that could yield such results is based on confusion and wishful thinking.