guys I think a real lot has to go wrong to be looking at this scenario. You would have to virtually empty out all three hydraulic systems. Pretty unlikely.
Are you aware that already many HYD DUAL LOSS happened on 320?
Mostly G/Y, 'cause GREEN RSVR LOW LVL but YELLOW PTU kept running and overheating YELLOW SYS?
So it needs only one of these days without BLUE SYS.....