Nope it means a demographic death spiral.A low birth rate, as long as it is not countered with immigration, means a declining population. This in turn means that there is more of everything good to go around,
Less people working means less people producing goods and services. We are already kind of seeing it now, just try to find a nursing home with a good staff when you can't take care of Nana anymore.
Taiwan, Japan and China all have this problem, but Taiwan will get there first.