As Reagan said:
"The trouble with our opposition is not that they are ignorant... it's that they know so much which isn't so."
I say we up the ante! I say that humans may be wiped out in 1,000 years even after they find a new planet!
Hawking sees the symptom. He has not diagnosed the problem correctly; i.e., the depths of the depravity of the human soul as it rebels against and flees from its creator. See Romans 1.