What's wrong with that? It would solve our social security crises for a few more decades. There's plenty of room.
Are you a follower of that radical ZPG advocate Donald Huddle? I remember having to read a book in college entitled "The Population Bomb" that expressed the prevailing opinion of most intellectuals.
Among other things it said that by the year 2000 we would be so crowded that single family residences would no longer exist; that there would be insufficient food to allow the inefficient consumption of meat (we'd all be eating soy beans), and that based upon studies of overcrowded rats we'd all be homosexual (didn't have gays back then).
When I fly over America, all I see are forests and farms. Last I checked the government was still spending billions on farm subsidies because overproduction of food is a big problem.