You are talking about access to resources and technologies, which is basically constantly rising, we couldn't stop that if we wanted to, so that's a given and more importantly orthogonal to the wealth that buys you goods and services.
The latter is absolutely zero sum, because of everybody has a billion, a billion isn't that much any more. E.g. human trafficking exists because some people are rich and others are poor, and the fact that even those poor people might have access to things an emperor 1000 years ago would have dreamed of doesn't change that, because the people who treat them like slaves have even more. It's all about the relative difference between people who are alive today, the absolute increase compared to people who lived N years ago is a red herring.
>You are talking about access to resources and technologies, which is basically constantly rising, we couldn't stop that if we wanted to
We could very obviously stop our progress in resources and technology. It has happened throughout history many times and we see plenty of modern examples.
You seem to be treating the accumulated products of civilization as though they are geological facts rather than fragile outputs of maintained institutions.
Maybe you should ask yourself why you believe that 1) access to resources and technology are "basically constantly rising" and 2) why the relative difference in wealth today is more important than the (magical?) existence of a system were everyone has continually gotten more access to resources and technology.