But the way the human race is behaving currently, getting off this dirtball in any meaningful way seems exceedingly unlikely.
We've already gotten off this planet, and will likely do so again, though I don't expect any humans will get beyond cis-lunar space this century. We may even send robot probes to other systems someday in the far future. Colonizing other stars? Not happening.
If a technological species is going to survive long enough to reach the truly high levels of technology and economics required for that, it can't wipe itself out by destroying its planet's ecosystem. It will have to develop a society that does not value endless expansion for its own own sake (the ideology of the cancer cell, as one wit put it), but that voluntarily stabilizes its population at a sustainable level and learns to value its home planet.
IOW, if a species is going to survive long enough to have the ability to colonize other stars, it has to become mature enough to not want to, because it's made its homeworld (and home system) so very very nice and gotten interested in other things. (What other things? I can no more predict that then a Neanderthal could predict rick-rolling.)