There are several factors that have to feed into the decision of staying versus going.

* Weighing dangers of staying versus going

* Communications

* Injuries

* Members of party and their ability to trek long distances

* Chances that someone will look for us

* Chances that someone will see signaling

* Likely distance to rescue

* Navigation

It's vanishingly unlikely that I'd be in this situation because my car kit is much better, and also because I'd have left a trip plan with someone.

In the situation Susan describes, I'd first set up a signal fire and make ourselves as visible as feasible, including from the air. Next we'd look for water, do what we could to get comfortable, and perhaps spend some time looking for food. If a day or two of that didn't pan out, I'd start to think about leaving.