Then this also could explain why the forces of the Shadow have not done more to expand it. If they do something wrong then the whole thing could snap shut. And Shai'tan, the ultimate paranoid leader, would never let his minions take that risk. Or maybe at the beginning of the War of Power, when the DO's followers attempted to rip him free, they were using technology (ter'angreal) that was subsequently destroyed. Why else would they try to rip him free and then do nothing for 10 years? Maybe he was mad at them for taking that risk. Another question is whether their attempt actually accomplished anything.

Personally, I tend to agree with you Etzel, but with one addition. I think that the two most impossible OP feats of the series (unravelling and healing severing) will both play an important role at the end. I suppose Rand severing Asmodean from the DO's protection, his blocking a Gateway, and cleansing Saidin were also impossible feats that may play a role in the end (am I missing any other moments where AOLers had wtf reactions? Moridin was surprised at the a'dam, or "involuntary rings," right?) Even more than unravelling a weave, Nynaeve's miracle healing of severing seems to me to be truly unthinkable in AOL terms, and narratively much more than just the ability to heal a few stilled/gentled characters. Moreover, throughout the series, we have repeatedly heard that skilled Healers are also the most skilled at killing with the Power, and I think that whoever is most skilled at Healing severing would also be the most skilled at unravelling the conduit. It also just occurred to me that Semirhage was the other besides LTT/Demandred who could maybe block a Gateway according to Asmodean. That seems a bit odd to me, considering how her channeling talents are really much more specific than any of the other Forsaken. Her talents are also the closest Shadow parallel to Nynaeve's, so maybe it was a clue to Nynaeve's abilities as well? We were also recently introduced to the notion of unweaving when Nynaeve learned how to undo compulsion.

Now, it is possible that the Bore is part Gateway, part Power conduit and that knowledge of both unravelling and healing/damaging Power connections will be key to removing the Bore.

I am not sure, and I still feel that the ultimate solution may not really be OP-based, but I am certainly intrigued!