It may be a cynical argument but… People who wrote Grundgesetz doesn’t need to be elected anymore, people who does politics today, instead, needs to.
We live in a democracy, at the very end, the electorate is the true final judge.
https://en.wikipedia.org/wiki/Entrenched_clause#Germany
Germany’s constitution protects certain parts from changed through regular legislation. This was done specifically to prohibit the rise of authoritarian governments.