And, because fans will generate fandom independently, some fandoms developed in isolation from mainstream media fandom, such as the Xena: Warrior Princess fandom.

Xena partly developed in "isolation" thanks to the overwhelming number of femslashers who watched it. It's probably the first fandom that was majority femslash, but I know some Xena fans who did cross over with other Western media fandoms too.

Femslash fandom has a history on its own, touching the history you wrote, but still remaining quite separate from it. I don't even know most of its history or everything it encompasses, and I've been reading femslash since the nineties and writing it since some time later.

I say that not because I want you to write the history of femslash, but because I think this is a really good, thorough history that could use a mention or two of femslash, at the very least to point out that it is distinct from "slash," which is supposed to be an all-encompassing same-sex category that almost no one actually uses to refer to m/m and f/f both, just for m/m, and because I think it's awfully important to note the reason (or one of the reasons) why Xena fandom arose in such a distinct fashion from many of the other fandoms that you mention.