[indrax]

You might be right, but none of that speaks against the urgency of doing it, or explains why people don't see it.

[foljs]

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.

[gte910h]

I will have to say, even having a highly dependent colony on another planet will push towards self-sufficiency for pure cost reasons alone.