slim......It's just kind of a semi-educated answer, but I think that when brokerage firms stop accepting short orders without having some evidence that the trader can back up the trade, that this naked shorting will stop. From what I understand about this practice, a broker will accept a short order without any evidence that the trader has taken a short position. It sounds really dumb to me, but that's what the explanations I've read say.
I even asked my broker how they do it, and he didn't even fully understand. That didn't exactly make me confident that anyone's going to clean up the situation in the near future.
As far as how a stock will get off the sho, I think that's only going to happen when the brokerage firms start asking traders if they can cover the order and make sure they're telling the truth and producing legitimate stock certificates on demand. It all depends on the SEC demanding that brokers do their job.