I don't see how you make the jump from 'serious' to 'real literature'. I understood 'serious' to mean a serious attempt on the part of the writer to make the two universes make sense to each other and mesh smoothly. It could still be rubbish writing, even with the best intention and hard work of the writer. Something more playful, such as pentapus's well written and criminally brief stories about Methos in the Pegasus Galaxy don't try to make sense of it at all, don't set up much in the way of backstory, they just smush Methos into SGA and draw out the amusing things that such a contradiction entails.

Though two SF shows are not such a good example, and I should disclaim that I don't subscribe to cereta's original essay and I have friends who quite seriously study play who would describe everything we do as media fans as play.