The PPS is probably 'hanging in" for only two reasons. The average joe has not come to grips yet that he was suckered and thus cannot emotionally bring himself to sell at a loss; and, most brokers won't let you sell now anyway. When all that washes out, there will be no bottom, just a slow, steady slide into oblivion.
I just like the fact the PPS seems to be hanging in as the company management gets things resolved.