With no frontier, no cloud city-like "2001: A Space Odyssey" or "Voyager Station"-like space stations, or L-point orbiting Stanford Torus type space colony city-states, with accompanying networks of other [custom] facilities and facilitation, ships, and shipping, in our near future, civilization is in decline on the planet, entropy exists invincibly in growing bubble-like effect within the iron curtain and closed system of a shrinking world, and, thus, we aren't and won't be prepared in any way for any mass extinction event, or any EMP threat from our sun. We won't even be expanding a warning network on Earth, much less expanding to the reaches of space in an ever widening, ever farther-reaching warning -- and potentially prevention -- network.
To borrow from C. S. Lewis, 'The Abolition of Man' as I've done before: Aim for Heaven (for me to mean the heavens, the frontier horizons of the universe) and get Earth thrown in. Aim for Earth and get neither. (The physics couldn't be simpler stated in layman terms. Stephen Hawking called our breakout an imperative of Mankind. Not just important, but "imperative!")