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Really? What about couples who decide to have only one child, or two? These people are of the same mindset, and their numbers are not statistically insignificant. We are now below replacement level, excluding immigrants.

It's not really a concern, either way. As of 1999, the American fertility rate was 2.08 children per women, which is just a whisker below replacement levels.

There are indications that the American fertility rate is in the process of increasing slightly.

So, we're basically at replacement levels, maybe a bit under. We can certainly make up the shortfall, if any, with smart immigration. Currently, our high immigration rates mean that the American population is growing at above replacement levels. So, we could cut immigration substantially and still be at replacement level.

Other than paying for welfare programs, there is no reason to expand the American population.