Originally Posted by
codystarbuck
The copyright is good for quite a long time to come; but, that only covers the stories themselves. The characters and related elements are covered by trademarks, which have an expiration; but, which also have to be maintained through use. You can't just trademark something and not use it. That is part of the reason why you see characters pop up briefly, then disappear again. It helps keep the trademark active, even when the character isn't part of a regular title.
Corporations were behind the copyright extensions, particularly Disney and Warner, to prevent characters like Bugs Bunny and Mickey Mouse from entering the public domain. In other words, don't hold your breath.