The model, of course, is just an excerpt of the whole story. There would be more feedback loops if we include the exploitation of resources and financial markets.
From its first analysis tariffs seem to be increasingly negative thus free markets are the best way to go. But this is just because of the weighting of the connections that not only depends on the concrete country or region from which perspective we look at the model but also from our moral standards.
Also, the model assumes that the burden from pollution etc. would be relatively low with relatively little effects on jobs. There is no doom scenario implied.