I kind of like the idea of the voice being the Dark One speaking to and about Rand. It would kind of be a foreshadowing of Veins of Gold in TGS, I guess, when Rand almost unmakes the Pattern. I presume that the Dragon/Chosen One/Champion of the Light has to voluntarily destroy the Pattern for the Dark One to really win, mostly from this RJ quote and Veins of Gold:
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RJ: Yes, the Champion of the Light has gone over in the past. This is a game you have to win every time. Or rather, that you can only lose once--you can stay in if you get a draw. Think of a tournament with single elimination. If you lose once, that's it. In the past, when the Champion of the Light has gone over to the Shadow, the result has been a draw.
So in tEotW, Rand yells into the air at Ba'alzamon, who Rand thinks is the DO, and says, "This has to end!" The DO, knowing that only Rand has the ability to completely end the Pattern and give him total victory, is worried that Rand is about to assault Shayol Ghul or use too much of the Power or do something else crazy and get himself killed before he has a chance to get him to unravel the Pattern. Hence, the DO tries to stop Rand from doing that just yet.
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"IT" being Tarmon Gai'don, I guess. Or just the "end." He's just trying to keep Rand alive by telling him the fight is not "HERE," in time or place. Translation: "WHOA! NOT NOW! PLEASE DON'T DO SOMETHING STUPID AND GET YOURSELF KILLED BEFORE I CAN CONVINCE YOU TO DO WHAT I NEED YOU TO DO. THAT WOULD RUIN EVERYTHING AND MAKE ME WAIT ANOTHER SEVERAL MILLENNIA FOR YOU TO COME AROUND AGAIN."
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I WILL TAKE NO PART. ONLY THE CHOSEN ONE CAN DO WHAT MUST BE DONE, IF HE WILL.
This would mean that only Rand, the "Chosen One," has the ability to unmake the Pattern and give the DO the final victory. From the DO's perspective, this is "WHAT MUST BE DONE." "IF HE WILL," of course. The Dragon has to do it of his own volition. I infer from RJ's quote that, though the Dragon has gone over to the Shadow on occasion, he's never been a true believer like Moridin and unmade the Pattern.
I think it's more likely to be an EotWism, but I do kind of like this idea.