Yes on the A319 you have triple hydraulics. If you lose all three while in the air you are dead.
If you mean lose hydraulic pressure in all 3 systems, then you still have the RAT to provide the pressure. There are also check valves to prevent excess loss of hydraulic fluid. Moreover, there at least 2 pumps for each hydaulic system. Losing a hydraulic system, as Rainboe states, is a non-event. But losing 2 or more is an event but still flyable albeit with some difficulties. I actually started a thread regarding this a few months ago.
High PNF workload!
It's exactly because of these scenarios that they are paid the big buck$. Most of the times, they are just system administrators.
