"Running out", and unsustainable pyramid scheme, are not the same thing. If America is not replacing itself, we have a problem that is greater than corporate. Our current baby rate is not sustaining our population. As is the case with most 1st world populations.
Most people who are so afraid of America losing its great, white European color, also happen to the the very same people suckling off its teet in the form of SS. When they realize the very fight they are ensuing to protect their whiteness is actually going to cost them in real dollars, we shall see the real irony of the situation!
Your second comment doesn't even make sense.