It just doesn't belong
"Attempts to apply the perspectives of literary theory of the adventure game genre have been sparse and unconcerted. Over the last decade...several individual attempts have been made to put the genre on the agenda of literary studies, but perhaps understandably, no breakthrough has yet been made." page 108-09 of Espen J. Aarseth's Cybertext: Perspectives on Ergodic Literature
I really hope Aarseth isn't too surprised at the absence of breakthroughs for adventure games into the agenda of literary studies. Adventure itself never made for great literature even in the traditional sense. It's had slightly more success in American literature thanks to authors like Mark Twain, but he's in a very small company. Do you typically associate adventurous literature with Shakespeare, Fitzgerald, Poe, Williams, Austen, Hawthorne, Whitman and Steinbeck?
The lack of legitimacy among the literary elite is an enormous problem to overcome, but, as in the case of Twain's literature, can be done. Adventure games' biggest and most irreparable one is that they are games. They won't be accepted as a genre of literary studies because they are not literature. It really doesn't matter how great a storyline is produced. Nowhere in Merriam-Webster's definition of literature does it mention anything about digital stories created for interaction with the audience as being literature.
Without a change in the definition, which I can't see ever happening, adventure games will only exist as a medium of entertainment outside the scope of literature. If those who create adventure games have a problem with that, tell them to go write a book. Maybe then they will understand the separation of the two and let it remain as is.