Which is one reason why I don't think they will actually change who the Dragon is. Making the change to the prophecy mostly unimportant in the grand scheme of things.
Like I have said all along...there's plenty of reason to be concerned about the show itself. 8 episodes for the entire first book is definitely one of them. I think they should have gone with at least 10.There are going to be changes in moving from one medium to the next, but usually it’s for expediency. But with 4 episodes left there is no way they can finish eye of the world making what they did to Perrin’s backstory unnecessary. Not to mention what’s been left out of his so far
The changes to Perrin's backstory is another, especially because, thus far, they haven't really done much to show why they decided to do them. I have theories about them...but they're just theories.
I just don't get hung up on changes that, in the large scale, aren't, in my opinion, likely to make a big difference.
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It doesn't matter if the person who breaks the world is sane or insane. World still broke, yo.
The prophecies hardly even mention madness...aside from saying that the Dragon will "heal the wounds of madness and cutting of hope".