This, to me, will be Martin's last change to prove himself. I never judge a writer on one book alone, and the only solo effort by Martin I've read was Seize The Fire. I found it utterly unreadable. Not because of plot, which was actually interesting. But the completely uninteresting writing style used by Martin. I have, however, read some of the novels that were a team effort between him and Andy Mangels. Some of those were good, others not so much.
So, I personally will have given mr. Martin enough changes to impress me. By himself, he has not done so. If Fallen Gods doesn't deliver, I doubt I'll ever read one of his novels again.