In this review of After Poststructuralism: Reading, Stories and Theory by Colin Davis in Postmodern Culture David Bockoven addresses the problem of philosophical legacy:

Unlike Habermas, for whom the concept of the unfinished project of the Enlightenment appears black and white--either you're with Habermas's efforts to complete the early Hegel's abandoned project of communicative reason or you're against the Enlightenment and all the fruits of modernity--Foucault, Derrida, and even Habermas's own Frankfurt School progenitors Horkheimer and Adorno maintain a more complicated relationship with the philosophical past. For Derrida, in particular, "it is the nature of the legacy to be in dispute; and this is as true of Kant's legacy as it is of the legacy of poststructuralism, which we have still not settled" (7). So in looking forward, we also need to look back, but perhaps look back "otherwise." We can no more be "after" poststructuralism than poststructuralist philosophers can be "after" Kant, in the sense of being over Kant.