I think that’s the big disconnect; it’s social, not technical. Communities that are not tuned into this one don’t always think about preservation as a community need. “I better upload a copy to the IF Archive in case my web site goes down ten years from now” is not a common sentiment!
Colin Post was getting started on research in this area. See thread: Let's Talk about Collecting Narrative Games in Libraries . His notion was to come up with a community license which would allow games to be archived by libraries. (Open-source and CC licenses allow this, but the vast majority of IF games don’t use those licenses.)
He got as far as getting an IMLS grant to support that research. However it got torn up in April as part of the US government’s general, um, tearing up of things.