Consider how bad things are in Central America right now and then remember that despite the abject violence currently happening in many countries there right now, the U.S. still harbors deep anti-immigrant sentiments and we regularly turn away people fleeing said violence and return them to the custody of their would-be killers.

Yeah, you won't need an answer to this question when the times comes for us. You'll know, and you'll be willing to get on that boat or airplane leaving for anywhere else even if they aren't accepting refugees or the odds are slim that anywhere else will take you, because the alternative is certain death.

You're probably better off trying to emigrate now rather than waiting for things to get worse, if you are in a position where you can make that choice. Some people make their livings preying upon those who are desperately seeking an escape, so it's a bargain right now to leave for the cost of a plane ticket and whatever elbow grease you need to put in to achieve citizenship abroad.