system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Is the world really doomed?

A lot of smart people (Shaun, House, and Eden I think) seem to think that this planet isn't worth trying to save or rebuild, and so make their ultimate goal to evacuate this one and find a new planet. Is this world really not worth saving anymore? Will humanity ever be able to rebuild what it once had?

EDIT: Just to add my two cents on the aliens:
The fact that there are aliens is definitely canon, but I think we can assume that aliens didn't cause the Great War, partly because that fits with nothing else in the story, and partly because it destroys the series' theme.  It would turn "war never changes. Man's destructive and hateful nature will always cause conflict and suffering, even to the point of his own destruction" to "aliens like to fuck with humans".
gpt
We would have to do it with far few resources, but it's certainly possible. The US just mastered fusion, which is a clean source of energy that the Brotherhood has mastered with their power armor and old cars. With fusion power they can power the wasteland, but it will take time to do so if they continue to be so closed minded.

The problem is their are people who don't want that happening, the Zetans. It was hinted on Mothership Zeta that they caused the Great War, and perhaps will wipe anyone out who tries to go to space or master certain tech, like fusion.