Luka Modric will be at Real Madrid for one more season. Kroos is gone, but Modric continues. Maybe he will stay to win one last Champions League trophy, but I don't think that will be possible. Next year the competition will be much bigger. The CL format has also changed, so it remains to be seen what kind of season it will be.
This is still an advantage for Madrid because if they are left by senior players then Madrid will indeed feel more lost because for an era that in my opinion is one of Madrid best eras only Modric, Carvajal and Vasquez are currently left after Nacho decided to leave and Kroos retired. If all of them leave at the same time, it will be a loss that is difficult to describe and although Madrid can still compete, the situation will still not be the same .
Although Modric role in the main lineup may be a little shifting, his presence in the squad has boosted the mentality of the younger players and this is a good thing and it is possible that Modric will also follow in Kroos footsteps where he will retire at Madrid if he looks at his current age .