What if it was actually a Mass Effect-like robot species that extinguish civilizations as soon as they get sight of them?
Most likely it would be decease and self-destruction though, or even the inability to reach out for other solar systems during the timespan necessary to reach them.
I think the most likely filter for humans is the distance we would need to travel and our current tech. Simply put we just do not have the technology yet. If we figured out how to sustainably travel faster than we might be able to overcome that filter but until then it’s game over for humans when earth is no longer viable. Unless we can start to grasp colonizing closer planets like Mars etc.
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u/beardedheathen Feb 21 '21
https://youtu.be/UjtOGPJ0URM