I think part of the problem everybody seems to be having defining "standalone" is simply the way we tend to consume media in this day and age. With the advent of the DVD box set for television and the trade paperback collection for comic books, we now look at stories in different ways. Authors and producers can now safely assume that if somebody really wants back story, they can simply go and find it through a variety of means, and not everything has to be recapped ad nauseum. We're no longer limited to the information presented in the books, comics, or novels we read. Everything we want to know for context is on the internet, and the previous installments are generally readily available whenever we want them.
Precisely. What baffles me about a lot of the complaints re: interconnectivity is this sense that there's some kind of deadline that needs to be met; as though, if you're not up to date with whatever new release is coming out, it'll vanish into the aether without you ever having the chance to consume it. Apart from the irritating fact that some of these books go out of print (and then there's always the electronic versions, assuming the e-book department gets its act together), these stories aren't going anywhere. You'd think some of these people have never picked up an older book. I don't worry, say, that I can't possibly read Foundation and Earth because I haven't read the previous Foundation books; I'll just start at the beginning with the first book and get to the latter entries in my own good time. Or if I missed a large chunk of a TV series and don't think I'll be able to catch up to the live broadcasts, I'll wait for the DVDs to come out at the rental store. It's like, chillax, yo: not everything needs be instantaneous.
Creditorly yours, the Rent Roman