Well, since the only question of any importance is "can you survive until you get help?", I will have to admit that I have absolutely no freaking clue. My answer to the pole is "no."
Here's a couple of unorganized thoughts about various ideas mentioned already:
1. The injury. Either you can move around, somehow, or you can't. If I can move then it is either an annoyance (not an emergency) or at worst a situation I think I probably would survive. There are so many options when you can move, even if slowly. But if you can't move, all bets are off because everything hinges on how you're injured and...
2. ...Where you are. Odds are (outside of skiing) I'm not going to break my leg on an easy trail. It's going to be on something steep, or with talus or blowdown. It's the probably not that cozy spot in my mind (you know, by the hemlocks and the bubbling brook) where I can lazily take my time unfolding a bivy and donning layers that require pulling arms into sleeves and whatnot.
3. Surviving by building a fire. Okay, so scratch that one in the blowdown or on the talus. Even if you happen to be in the hemlocks by the bubbling brook (in the rain) you've got to gather all the (wet) materials and then convince them to flame. This is an art, difficult to achieve by experienced people. Besides, if you have the energy to wander hither and yon gathering tinder, kindling, and fuel enough to keep you going all night, you might consider devoting that energy to walking out, or maybe...
4. ...Stuffing your clothes with leaves or any other material that will create additional dead air space even if it is wet. This may not be a magic bullet, but unlike a fire, at least I can imagine actually doing this.
Finally, on a philosophical note, at a certain point I think all these "what ifs" become counterproductive to understanding and enjoying the woods. It's like going to New York City and then spending all your time worrying over every shady looking person you encounter. You may perhaps be ever-so-slightly safer, but you're not going to enjoy the city very much.