I think it would be a good idea to start colonizing space before "we have our shit figured out on earth", since you know, that will never actually happen. We will have wars on earth for all eternity, we should colonize and explore space anyway.

Honestly, I strongly believe that striving to make space habitats work is one of the things that will finally teach us what we need to know to live sustainably on earth. The thing is, an affordable space colony is one that recycles almost everything, one that works mostly as a closed loop, a sustainable bubble. So in other words, if you know how to survive in a space colony, you know how to live without destroying the earth. And extreme sustainability is really the natural goal with any large space colony. Unfortunately nobody is really trying to do that here on earth, the funding, the engineering, it just isn't happening. But if we start seriously attempting habitats in space, then people will be attempting that somewhere... And once we figure out how to do it, it can be reapplied to life on earth.