Glad to hear that everyone landed safely.

The hydraulic system must be designed with redundancy, but when the entire system is broken simultaneously, it would be a serious trouble. Such was indeed the cause of "the deadliest single-aircraft accident in history":
http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123

It is also remarkable that an off-duty UA flight instructor, who had studied the JL123 accident, helped saving many lives in a similar accident later:
http://en.wikipedia.org/wiki/United_Airlines_Flight_232

The hydraulic system must have been much improved after these accidents, but I guess the probability of a complete loss of hydraulics is still not zero....