I have the opposite perception, that "Singularity" is worse than "artificial intelligence." If you want to avoid talking about FOOM, "Singularity" has more connotation of that than AI in my perception.
I'm also not sure exactly what you mean by the "single scenario" getting privileged, or where you would draw the lines. In the Yudkowsky-Hanson debate and elsewhere Eliezer talked about many separate posthuman AIs coordinating to divvy up the universe without giving humanity or humane values a share, about monocultures of seemingly separate AIs with shared values derived from a common ancestor, and so forth. Whole brain emulations coming first, which then invent AIs that race ahead of the WBEs were discussed, and so forth.
How about "Threats and Opportunities Associated With Profound Sociotechnological Change", and maybe shortened to "future-tech threats and opportunities" in informal use?
Why does SI/LW focus so much on AI-FOOM disaster, with apparently much less concern for things like
Why, for example, is lukeprog's strategy sequence titled "AI Risk and Opportunity", instead of "The Singularity, Risks and Opportunities"? Doesn't it seem strange to assume that both the risks and opportunities must be AI related, before the analysis even begins? Given our current state of knowledge, I don't see how we can make such conclusions with any confidence even after a thorough analysis.
SI/LW sometimes gives the impression of being a doomsday cult, and it would help if we didn't concentrate so much on a particular doomsday scenario. (Are there any doomsday cults that say "doom is probably coming, we're not sure how but here are some likely possibilities"?)