In a way, I think if you plan to do the whole thing with one artist, and they're committed to it, and they say they want to do it, and you give them a whole year's delay, and they still aren't able to get it finished, I don't see what else you can do.
I mean, delay it forever? This time after it's already started coming out? There's no good option at that point. Maybe you just shouldn't commit to something like that if you can't get it done.