contemporary stage spaces

While the framework of the more mainstream proscenium stage has basically been left unchanged for the past 400 years. Advances in technology have certanly been incorporated into design for the stage. Yet, audiences have become exponentially blasee towards the form as the years go by? Is this then a question of onstage aesthetics? It's difficult to say, although I would reason that the Greeks did not abandon the purpose and their reactions towards their theatre after a actor/God was hoisted up on a big wooden crane....