After stumbling upon the wild hunt I came across
https://en.m.wikipedia.org/wiki/Annwn
Anyways digging deeper and making a few more leaps in logic there seem to be some parallels in Welsh mythology and using the above link as a breadcrumb some odd inferences can be made as to the outcome of the shadowlands.
Purely posting this for speculative fun, I dont have enough base knowledge over the subject to add my own opinions, other than some observations such as the relation possibly between bran and medivh, the triad of Thrall jaina and tyrande and if you dig deeper im sure you can find many other connections s between the developing story and mythology of the past.
I've seen many quotes of comparisons in the more well known (at least it seems among these forums) Greek mythology and I figure for those of you who are interested in creating speculation for the future this may be of interest, also for anyone who does have more knowledge over the subject it would be interesting to hear your interpretations.