"Let's be brutally honest here. Nobody wants to stand up and admit that large-scale immigration of this kind is the only thing that might prevent the U.S. from descending into the catastrophic deflationary spiral that is going to cause chaos in Europe and the developed nations of Asia over the coming decades."
Prove it. Cite your source.
Basic economics. A decline in demand for a product or service (brought about by declining population) results in excess capacity, which drives down the price of the product or service as well as the value of the labor, company, or facility that involved in the production/service process. This is a classic case of deflation.
This deflationary spiral is exacerbated when the declining demand is accompanied by increased costs associated with taxpayer-funded pension and health care demands for people who no longer contribute to the economy in a productive capacity. A few years ago, one of Denmark's leading economists used this scenario as the basis for his forecast that the economies of almost every Western European nation would collapse in the next 50 years under the weight of their enormous pension and health care liabilities.