Modern discursive theory seems built on the assumption that everything is language. Unlike saying, for example, that everything is state in flux, the assumption is obviously reductionist and can be discarded off hand. It would be interesting to formulate a discursive theory based on the less counter-intuitive assumption that everything is action instead.
The assumption that everything is action was, of course, refuted together with Aristotelian physics. If we limit the scope to that of human and academic discourse, it starts to make sense. It has the advantage over everything-is-language that it encompasses interactions with the world.