Iamon lyme: Did I say that... No.

Do I presume there is no means for us to survive.... No.

Eggs in nests have a natural ability to be able to leave as they grow.

" because there are few if any other systems in our gallaxy cabable of supporting life... in fact, the chance of finding any within our gallaxy is probably next to zero,"

That is incorrect. The evidence now through the likes of the Kepler telescope is that there are many places we could live in this Galaxy. The evidence is that Mars once did have life, Just it lost it's magnetic field... well, most of it.

Dude... dem boffins are blowing most previously held theories about how rare planets such as ours are.. they are not so rare. The Universe is geared to create the necessary elements we need for physical existence.