Practical chances of having something done affects the sense of "urgency to do it".
Even more urgent than colonization is the achievement of immortality, but I don't see people urging to achieve it for the same reason, i.e they think it's not practically achievable.
Even more urgent than colonization is the achievement of immortality, but I don't see people urging to achieve it for the same reason, i.e they think it's not practically achievable.