We've had massive realignments of the labor force before. At one point agriculture was the industry that all of society was built around. Nowadays, it is a small part of tge economy, with most people having little more than a surface understanding of how it works.

These realignments are generally not pretty, but hardly civilization ending.

At worst, this realignment will see humans go the way of horses after the automobile instead of farmers after the industrial revolution. That is to say, at some point, there may be not be new jobs for humans to pivot into. However even that is not an existential threat to civilization. It is a threat to democratic capitalism; but civilization existed before democratic capitalism, and will continue to exist after it.

Having said that, the claim that this latest technological innovation will finally push humans out of the labor force has been made before; and I don't see any reason yet to think that this time will be different.