From his contribution to Portraits of American Philosophy:

I believe that there is, at least in this country, a more or less general agreement among philosophers and other scholars that our  subject is currently in the doldrums.  Until not very long ago, there were powerful creative impulses moving energetically through the field.  There was the work in England of G.E. Moore and Bertrand Russell and of Gilbert Ryle, Paul Grice, and Herbert Hart, as well as the work of various logicial positivsts.  In the United States, even after interest in William James and John Dewey had receded, there was lively attention to contributions by Willard Quine and Donald Davidson, John Rawls and Saul Kripke.  In addition, some philosophers were powerfully moved by the gigantic speculative edifice of Whitehead.  Heidegger was having a massive impact on European philosophy, as well as on other disciplines–and not only in Europe, but here as well.  And, of course, there was everywhere a vigorously appreciative and productive response to the work of Wittgenstein.

The lively impact of these impressive figures has faded.  We are no longer busily preoccupied with responding to them.  Except for a few contributors of somewhat less general scope, such as Habermas, no one has replaced the imposingly great figures of the recent past in providing  us with contagiously inspiring direction.  Nowadays, there are really no conspicuously fresh, bold, and intellectually exciting new challenges or innovations.  For the most part, the field is quiet.  We seem, more or less, to be marking time.  (pp. 125-126)