Madrid might not have an exact replacement for Toni Kroos, generational talent as such are irreplaceable, but in reality I think there more than enough players in the Real Madrid rank that can occupy the same deep-lying playmaker position that Kroos occupied for the team,
Indeed. A legend cannot be replaced. However, that doesn't mean that Real Madrid can't move on, because after all, Real Madrid is a club that can regenerate very talented and sustainable top players. Now, let the era change and let the young players compete and strengthen the club. Because, it was from them that Real Madrid's next strength was born.
Now, as you said, they at least have Camavinga or Valverde for that, although they can't be compared to Kross, but their abilities are very good and significant to strengthen the team in the midfield. Not to mention Real Madrid's front line which is no longer in doubt, then, with the back line which they are currently starting to rebuild to become even stronger.