OK, so maybe I was the only one who was super paranoid about getting through this book as fast as I could to not get things spoiled by the internet.
Well, when you finish and are reading this thread, here's a cool article that puts together some answers from Brandon Sanderson, including to one of my questions. He says the anti-balefire was witnessed, and all of the cracks get healed up.
http://www.tor.com/blogs/2013/01/brandon-sandersons-wheel-of-time-answers-from-torchat