From what we know, the Nevernever contains many different "realms", separate locations that each reflect one myth, legend, religion or other belief of the world. Faerie is the closest and most stable world but it still has no set geography, size or even time; those things are mutable depending on what some Powers want and beliefs on Earth dictate. Humans and human-like creatures seem capable of existing in the Nevernever even for long times, given that humans captured by Fae don't seem to die outright.
So, a couple of things I've been wondering about;
1) If a number of humans are trapped in one of the more distant but still survivable parts of the Nevernever, can they live there a long time?
2) Suppose the Realm they find themselves in has much more rapid time or they were trapped a few millennia ago. Given enough time in either case, can they "go forth and multiply", building a new society?
3) Is the realm shaped by their beliefs? Are they themselves shaped by their beliefs?
4) If the answer to #1-3 is yes, was this how many Faerie realms could have been created in the first place? Like Faerie itself but also the Nine Worlds of Norse myths or Olympus/Tartarus of Greek mythology? Parts of the Nevernever originally populated by humans that slowly changed into part-human creatures?