I’ve been thinking that FTL might just be truly impossible which is why we don’t see ETs showing up. I know that there are theoretical designs for FTL systems, but so far the details of implementation remain elusive and the energy requirements are enormous… so, could be impossible.

Beyond that, I think humans may eventually colonize the moon, Mars, and the clouds of Venus, but I highly doubt we will make it out of the Solar System before our species dies out.

Edit: I hope to be wrong.