Nearly every company that makes video is finding its way into the streaming media business. Disney is planning its own Netflix competitor for 2019, backed by content holdings like Marvel, Lucasfilm, and Pixar. AT&T plans to launch its own Time-Warner focused equivalent around the same time. Similar competitors from Amazon and Comcast are already taking shape. With the streaming subscription business growing this fast, everyone wants a piece — and they’re ready to fight for it.