IF prices are determined by people's preferences, then the fact that prices are not rising, even as resources are being depleted, then this suggests that there are other things that people would rather spend their money on. The critical question is whether or not there are minimum required amounts of some finite resource. Physics suggests that there are, as there are minimum energetic requirements for physical processes. However, via things like virtual reality, we may end up in a world where everybody is 'wired' and very little resources are required per person.
Ostriches come in at least two breeds.
Those that deny the physical reality of the world, and those who predict destruction based on the extension of patterns of resource use into the future based on current technology. There are certainly physical limits on what our technology can do, in physical terms. This is a hybrid measure that can grow in the face of both reduced resource use and reduced welfare. It is a poor measure, but there is no theoretical reason this measure or human welfare cannot continue to grow for a long time to come.