I have no idea what TFR has to do with anything here. So Swiss people aren't having kids like they were before, that is not relevant to education outcomes, maybe they are just really good in teaching sex education.

A sub replacement rate TFR leads to extinction, not to mention wreaks havoc on government policies that have long been dependent on growth.

Switzerland has a high immigration rate, so they aren't going to be hit by this in the short term, and in the long term I don't think they are going to sweat some population loss.