That which ought to be is not influenced by what is. It’s true that worker control over the means of production is preferable to capitalism, but neither scenario here actually requires it. In fact, if the economy is fully automated, it would imply that the means of production couldn’t be owned by the workers, since there wouldn’t be any. That’s how you get post-scarcity space communism. Socialism would ensure the longevity and existence of an arrangement that results in automation leading to better lives for everyone rather than human extinction. However, I’m beginning to suspect that with the time frame we’re working with, aiming for socialism to the detriment of achieving any such arrangement might be a serious misplay on our part. Of course, that opens the possibility for humanity to be subjugated by an oppressive regime of immortal cyborg oligarchs. Even so, this horrifying possibility still preserves the opportunity for rebellion and revolution to set things aright whereas extinction would be ultimate defeat.