It would be assuming we do reach post scarcity for all essential goods. There’s more than enough bored people right now that would throw away the rest of their lifespan for a few months in space to fill a intra galactic space exploration organization; give those bored people all the free education they can handle and you have a successful star fleet.
“lately”? This is foundational to the entirety of left wing thought.
The left starts at abolition of capitalism and by extension corporate profit. If you disagree with that, you’re simply not left wing in any way, you would be better off in right wing or far right sites like reddit or Facebook. They’re their product of your beliefs, stick to them.