Here are two scary storylines that get discussed pretty regularly here on HN:

a) AI and machine learning will raise productivity so much that they will steal millions of jobs from people.

b) Global population will eventually go into decline, which will crash the economy by killing growth.

But, these two stories look far less scary when considered together. In fact they seem directly complementary, although the timing is not likely to work out perfectly, so it won't necessarily be smooth sailing along the way.