Joel Kotkin and Harry Siegel fear that population decline will distort our politics:

[I]f singletons are swelling as a voting bloc and interest group now, the demographics of childlessness mean that they’re likely to lose out in the long term. Already, retirees have bent government to their will, with people 65 and older receiving $3 in total government spending for every dollar spent on children younger than 18 as of 2004. At the federal level (which excluded most education spending) the gap widens to 7 to 1. With an aging population, that spread will continue to expand, placing an ever-greater burden on the remaining workers and creating a disincentive for the young to have children.

In the long run, notes Eric Kaufmann, the author of Shall the Religious Inherit the Earth?, high birthrates among such conservative, religious populations as Mormons and evangelical Christians will slant our politics against the secular young, childless voting bloc as well.