Honestly, at this point I've given up on worrying about humans surviving. Our "leaders" have made it pretty clear that "long-term survival" is just not on their agenda, and we've allowed them to amass enough "wealth", "power", and weapons to make changing their minds pretty much impossible. What I worry about now, more than anything else, is that humanity has reached a level of destructiveness that we may trigger something literally catastrophic to this planet's ability to support life at all. What an incredible loss that would be.