Those poll numbers were ridiculous - even McCain managed to take 4% of black voters in ‘08.
Nope, I'm pretty sure Romney really will get near 0% of the black vote. Less blacks may vote, but the ones that turn out will be nearly 100% for Obama. At this point it's a loyalty thing, protecting one of "their own". Just take a look at cities like Detroit. No matter how bad it gets, they will still never vote Republican. In fact, the worse it gets the more it seems they harden in their resolve, refuse to admit they were wrong, and vote in even higher percentages for black Democrats.