Well presumably we will run out of resources. As people have been saying that since the 1800's I discount that some, but we will inescapably run out of some of the resources we are currently using, but they may be replaced by other things that we will invent or switch to. The Biosphere is absolutely at risk, but it is a collective action problem of the first water, and probably only loosely related to what industrialized economies do (even shutting them down might perversely make the problem worse rather than better). Aside from the resource problem, there is no reason that its not sustainable.