There is no future world in which having more assets is a bad thing. The worst case scenario, which I find to be extremely unlikely, is that assets no longer have value. In a situation like that, we'll either all be dead or have everything we need.

Just think about the technology that we have invented over the last 100 years. Someone born 100 years ago today witnessed massive changes, and yet, life is still pretty much the same as is was back then, just a lot better. I think that it is quite likely we will experience the same thing.