I've always been an advocate of moving off-planet, but sadly, our civilization isn't spending enough in terms of energy resources (for research, building of spacecraft and the development of space-mining) to make that a reality before we run out of both oil and coal.
We might not even make it before we run out of nuclear fuel.
I'm optimistic we'll find a way to make things work, but I'm realistic enough to understand that our current growth trajectory isn't sustainable in any way. The math just doesn't support it. And the amount of resources we need to consume to just move a single person off-planet are so big that moving even a tiny portion of our current population (say... a million people) would likely bankrupt the global economy. (say... 25 trillion dollars to orbit... about 100 trillion dollars to the moon?)
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Air travel is a waste. Bring on the telefactoring machines...
