Yeah, population isn't particularly important. If it falls, so what?
And economic growth isn't coupled to population growth. If it was, Africa would be the world's richest continent.
Economic growth on absolute terms is pretty meaningless. GDP per capita is more important, and a falling population makes it easy to grow per capita GDP.
True. What DOES benefit from rising population is rising asset prices. Real estate becomes more valuable as population becomes more dense. Corporate profits increase (and thus stock prices rise) as more customers are born who will "need" iPhones, medicines, and potato chips.
And more and more workers will be needed to pay taxes to redeem the debts Republicans incurred with their tax cuts for millionaires and billionaires.
Middle-class Americans are made complicit in the billionaires' enthusiasm for population growth by believing their future depends on 9% annual growth in their 401k's.