Must disagree. In our new century People are the real power -- the more people the better. One of the main reasons the US is still the new US (and not say falling into dhmmitude like the EU) is because we're the third most populous country on earth.
I don't know what you mean by "roll it back" but if we're still not #3 50 years from now we're in deep trouble.
People are the real power. Just look at the concentration of power in places like Indonesia, Brazil, Pakistan and Bangladesh - numbers 4 through 7 of the most populous countries on earth. The massive international sway and productivity of #9 Nigeria, #12 the Phillipines, #16 Ethiopia, #19 Thailand.
Masses of people haven't meant power since machinery replaced stoop labor and human wave military tactics in the early 20th century.
An exceptionally fertile underclass is only something to be celebrated if you work in the prison industry.