I don't think a solution for the frown-syndrome is anywhere near us at this point. for I believe it's essentially because of a low temper-threshold, people here have the habit of being ticked-off by the smallest of affairs; a piece of gossip, a 5 minutes wait at the traffic light, somebody not returning a hello, ... the small matter of a 100JDS by the end of the month to pay for rent and so on. Instead of going out of your daily pattern of days to address your frustration towards what really matters.
so nearly slaves to routine, you can't be ticked off by as many incidents, and be able to smile, since you are pre-occupied by your discomfort. well, rumor has it, that they are happy that way, it creates a balance. since we don't really have much else that we can afford to worry about and sweat on.
It doesnt worry me much the fact that they don't smile. time solves all. we may want to start telling better jokes or something. I guess, it's simply the influence a city has on it's inhabitants, Jordanian villagers are way better off. go see, and don't forget to wear a smile.
: )