The loss they just made in last quarter is not neccesarly caused by the PS3. Production costs of stockpiles of PSP 3000ś without selling them yet may very well be the cause of that combined with who knows what. Sony may indeed be losing on the PS3, but neither you or I know for sure.
Producing PSP3000s will not result in a loss for Sony, it just means their inventory goes up. They did produce some PS3s already for next quarter and that loss is incurred already, which increased their losses in the last quarter. They only way PSP3000 could result in a loss is that Sony still has a huge stock of older PSPs which need to be revised downwards because their selling price is lowered. That however would be a sign of very poor management from Sony.