The Superman situation was emblematic of how WB treats its DC properties. The Time/Warner conglomerate doesn't really value them as it should, primarily because it has such a diverse portfolio. Marvel, in contrast, only had its superheroes as assets, and so it concentrated all of its efforts on them. Disney now puts much emphasis on thoroughly utilizing those assets to maximize the return on its investment. That difference is why Marvel will continue to develop as many of its properties as it can, devoting all of its resources to the task, while WB will more than likely continue to underuse its characters.