We are doing much better in terms of food availability, lower chance of dying early from diseases, one can communicate with people over the entire world, travel easily to all sides of the globe, and many more things.
That people find ways to be less-than-happy regardless of material conditions. That does not mean the world is fundamentally zero sum. Actually I would argue that choosing to compete for the same things that everyone else wants, like living in the same places, is choosing a zero sum game where it is not needed.
It's possible that material conditions aren't nearly as important to happiness is commonly believed. Perhaps people are happier dying younger with a family and a degree of autonomy than they are living more years alone with little autonomy.
