We'll be "fine" if you consider endless resource-based regional conflicts, along with the political upheaval, mass starvation, boosted extremism, and the large scale conflicts that will arise as a result, "fine". We'll be "fine" in the sense that "some human DNA will still be operating in 1000 years". That is a very low bar for human achievement to aim for, and for my children's sake, I hope we do better than that.