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If you cannot go forward on the current path, and standing still is not an option, the only possible move is take a step back and find a new route. Simple as that. Painful, sure, but it had to be done sooner or later.Of course, they have good reasons to make their own mapping infrastructure. However, working on it does not mean they have to release it before it's ready (and it clearly isn't). They could have used the old Google maps app for iOS 6 (maybe with some surface tweaks), while continuing to work on getting their own maps into some sort of reasonable shape. Maybe they would have had to pay inflated fees to Google or something, but they certainly have the money to do that in the short-term. Of course the Google maps app has its own issues, but people are very used to it; continuing to use it on iOS 6, wouldn't have taken people by surprise or generated such an enormous amount of negative press for Apple.
The other possibility is that they didn't realize how poor a shape their maps were in. If that's the case, it's far more worrying, because it means they're in way over their heads, and suggests that the effort required to fix things is likely to be enormous.
Apple is usually closed mouthed, and tends to adopt a position of "trust us, really, we know what we're doing." Unfortunately that doesn't work so well in a case like this where they pretty clearly don't know what they're doing...