Toby, if what I've been saying sounds like I'm advocating a reductive agenda, I'll regret that.
Remember, I suggested a spectrum or continuum. So we'd agree that Do Androids belongs further on the spectrum towards literature than a lot of sf does. Remember too that the spectrum I've suggested is largely about reading. To the extent that a given work invites good reading, it's literature, while the more it seems to depend on things like inattentive reading, self-centered reading, or reading because we want to maintain our status with some clique, etc. it's subliterary.
See what's going on? Working with the spectrum may help us to keep focused on the work, not on extraneous things like the author's biography, whether or not the author was "influential," whether or not the author sold a lot of copies, and so on.
But I should emphasize that the spectrum I've suggested is a tool. It's presumably not the only way to talk about the experience of reading a given work. There might be other ways to do that, that still keep us talking about the work and not the author, not "society," not politics, not sales figures that we probably don't know about anyway, not influence, etc. (Those matters may have their place, but too often around here it seems people are talking about those things when they evidently think they are talking about a piece of writing. It is easy to type away about those things, hardly thinking about what we say but just repeating something we picked up somewhere, and not come to grips with the work itself. We may fool ourselves into thinking we are talking about it when we have been circling around it at a distance, never getting close to it.)