Do you think life on Earth is imminently going to end?

This is a very common thing that humans have thought for millennia, and has been proposed and supported by the experts throughout the times. And despite all the noise, there is nothing indicating that this is in fact going to happen.

Think we'll see any hint of interstellar colonization in our lifetime?

Haha, no chance in hell. Maybe by the end of this millennia, aka 2900 or thereabout. If ever.