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.
Real Madrid is the best team, not arguable. Florentino Pérez have made crucial planning for the growth of the club, always sticking to greatness and bringing in potential players. This season, more experienced players will exits the club because they've run out of contracts, besides some of them are now aged and unable to push further for winning. We're talking about Kroos, Carvajal and Nacho Hernandez, they might probably retired with winning the UEFA Champions League with Real Madrid and this time, as a legend for the club.