No matter what happens in the short term, if they allow the debt to fully convert into shares, they have bettered the company's bottom line. Heck, let's say it takes 15B to do it, the preferred holder would not be affected by the huge R/S and after that, the debt should be gone. Someone mentioned earlier today about them possibly selling the company. Well, if they are able to convert all the debt prior to a sale, they will profit from that much more from the sale.
Not saying this is their full intent, but to date, it does appear to be their plan to just allow the debt to convert, rather than use company funds. Perfectly legal for them to do so.