I don't suppose that this could have a larger effect than the gender inequality in many countries lacking a social safety net, but it could be a contributing factor.
The idea that women, given the choice, generally would rather prioritize motherhood seems totally plausible. If that's the case, it could indicate that we need to think about diversity differently.
But I'm uncomfortable with a side effect that some of these policies could have - subtly pressuring women to focus on motherhood. The solution is complicated though if the mere existence of a good maternity leave policy encourages sexism. Hopefully general parental leave can help address this.