"We might get lucky" - humans have overcome every adverse condition in our 2 million years alive, why do you have the hubris to believe that you know we can only survive if we get lucky.
"stop the coming disaster" - again, hubris to think that the only possible outcome for humans is a disaster.
"could snap back to...centuries ago" - this has happened once in the past 2000 years, you really think you're going to be alive when we enter a 2nd Dark Age.
I think it's the same sort of thinking with the "Jesus is coming back in the next 5 years" religious crowd. You want to feel important and part of something bigger than yourself, something planet-wide, so you're almost looking forward to being a part of it so you can feel like you're part of history.