It's not a belief it's a fact
The U.S., where birth rate is at a record low, has a similar problem, but luckily it’s not as bad. In fact, the U.S. is the only developed country in the world’s top economies that will see steady population growth in this century. “The declined births in the last two years in the U.S. are not a huge number. So it’s really difficult to tell how that will affect the population in future workforce, especially depending on what happens to migration,” Donna Strobino, a professor of population, family and reproductive health at the Johns Hopkins University, told Observer.
3 of the World’s 5 Largest Economies Are Facing a Population Crisis
Critical thinking time: Why is the US the only western country not facing a demographic time bomb?
I'm not saying you're right or wrong. If that's your chosen stance so be it.