Yes Real Madrid have no problems at the moment but we don't know when they have to lose the key to their game, Kross, Modric, Benzema and some other players. It is true that Vinicius has grown and developed very well, he has grown because of the support of his very experienced teammates, he must take advantage of this opportunity while his seniors can still play together.
If you look at this condition I still feel that they are ready for it and indeed it is proven by them bringing Tchoameni there. On the other hand, I also think that Modric's role can be replaced with Valverde, who for some time last season was often placed in Modric's position even though at the end of the season he was always on the wing.
I think that if some of these players are ready to be released then their replacement is already there, regardless of Valverde's role, he can adjust because he can be placed anywhere. it's the same as Marcelo in these few seasons with Mendy.