An interesting question that I think merits some discussion considering that Hollywood alone releases I believe somewhere in the range of 500+ films a year, and the many films that are made from other venues as well. Many of these films within simply a few years will be considered a relic of that particular era, superhero films seemed to be quite prey to this... Daredevil springs to my mind. So what's seperates the dated from the classic? Now folks let's all realize that what's considered "dated" is not universal, someone here might consider Daredevil to not be dated, in which case post an educated rational response to this. For instance in my eyes a film like "Rebel Without A Cause" is horribly dated while "Blackboard Jungle" which came out the same year is far more real to me and just as fresh as if I watched it 50 years prior.