Aberdeen and Hearts owe most of their debt to their owners, as such it is unlikely they'll collapse. St Mirren, although currently debt free, would need to seriously reduce their overheads if Rangers leave the SPL, that's why they might have a problem. Bear in mind almost every club has already got players, managers and suppliers on contracts that are already in place. You can't simply renegotiate, that's what Motherwell were trying to explain to their supporters, for all the good it did them.