As far as I know, no nation is at the point where it is actually impossible to regain or maintain an optimal population for its economy (this is, of course, excluding whatever impact the jabs will have on reproductive rates longitudinally- my statement is circa 2019). There's an awful lot of scares about it just like there are about climate apocalypse and other such shit. It's been used by both sides of the political aisle to justify both unchecked and unfiltered mass immigration as well as the redomestication of women.

Provided the jabs did not actually mass-sterilize the entire population in the long run, and provided we crush the trend of globalist social engineering in general, family size will find something approaching its Pareto optimum, just like it always used to. A high-tech post-agricultural society with long lifespans won't need 13 children per family, so people won't have that many unless they actually want to for the love of children. Likewise, people not compelled to breed for the state or God will find the career/family balance that suits them.

Eliminating scarcity and coercion from people's decision-making is never a bad thing.