I am really fond of the argument (I know found in the Althusser chapter of New Departures, I am sure it is elsewhere) that overdetermination will become the epistemology of a communist society. That is empiricism (and to a lesser extent rationalism), but determinist epistemologies nonetheless, have been the epistemologies of capitalism and as we move beyond this phase of humanity a new epistemology, overdetermination, will become predominate in society.
Much of the economic analysis (in fact all of it?) that has been undertaken within the framework of overdetermination has been done using the entry point of class (ie the work of Resnick and Wolff and many of their students including myself). The argument "why class" has been made many times and I will not repeat it here except to say that the choice of class as an entry point makes good sense within the Marxian tradition given the goals of our theories.
As we move beyond capitalism class will no longer be a useful entry point in the study of economic processes. Moving to a classless society will in fact render class fairly useless as an entry point for economic analysis.
The golden age of overdetermination in a classless society will have to find new entry points to study the economy, as an entry point of something that no longer exists will be both backwards and obsolete. The search for new entry points that logically make sense for economic analysis will be an important step moving forward.
Class will be regulated to the entry point that made sense under the system where the entire epistemology did not. It is only in moving beyond capitalism, and moving beyond modernism and humanism that overdetermination will have a chance to be fully utilized in society. Class as an entry point will have to die.