Your reasoning is flawed. Potential wealth is infinite. Cumulative wealth at any given moment is finite but growing rapidly. Currency will always have a func

Your reasoning is flawed. Potential wealth is infinite. Cumulative wealth at any given moment is finite but growing rapidly. Currency will always have a function because there will be certain services that will never be infinite, for example getting a massage from another human. Even with infinite resources and robots doing all jobs you can see how currency will still be worthwhile.