The most probable answer to this problem would be all literary theories that has existed since then are still acceptable to use in literary analysis. The thing is, the utilization of these theories for literary analysis are close to little to none. Literary theories, literally, bloomed in usage from 1960s through 1980s to the point that the practitioners and the people related to this made actions to the extent of including it to the academies' curricula. As of the modern times, it declined until it died out. This doesn't mean that the usage is prohibited anymore, it is just that its popularity has died out since then.
