Even if AI could cure all diseases today, and for free, people would still die from curable diseases.
Because nowhere in this fucking planet a company would let people get something without extracting every single possible penny from them, even if this would kill everybody that can't afford it. Well, this is something they already do.
Even if AI could solve all the problems of the entire world, people would still live a miserable life, with famine, disease and poverty, because it's from all this shit that big companies make big profits.
If you are an American citizen, you should not worry about the ayatollahs ruling thousands of miles away from you, but you should be doing something about the tyrant ruling near you.
I read something similar in the book The Goal from Eliyahu Goldratt more than 20 year ago.
You can be highly productive and yet produce nothing of value.