Perhaps. In practice, though, it seems like there does seem to come a point where adding more money doesn't necessarily increase demand significantly; if you already have a million dollars a year income, and that increases by a factor of 20, you probably aren't going to use 20 times as many consumer goods or services.

Maybe advances in technology are going to create enough new types goods and services so that increasing demand can keep up with increases in production, but I'm not sure that that's guaranteed to happen. If it doesn't, it seems like there is some upper limit where enough stuff is produced for everyone without needing more then a fraction of the population to produce it.