The survival of 11 billions means in the context of my post to live decently. I mentioned the problem of population 30 years ago, and we managed to feed them all and most of them got even better lives.

It took just 8 years to put a man on the moon since the decision was made by Pr. Kennedy. I agree NASA and other space exploration missions have budget cuts due to lack of interest in the political sphere, but this will slow things down, not stop them, and we are capable of great things.

We have limitation in brains in the sense that we need to get more people to be interested in science, because the more brains we get the more innovations and technologies we get and the better lives we will have.

Probably you are right that we are bound to Earth, and what ever happens to it will affect us, but even though keeping an optimistic view of the future may not allow us in reality to be a galactic civilization, at least we would have tried our best to save our species.