However, if Real Madrid fails in the Copa del Rey then it looks like this season will be a season of failure for Real Madrid who has the chance not to win any trophies this season. But yes, because Real Madrid is king, then of course Real Madrid will still be the favorites to win the title, whether in the Copa del Rey or in the Champions League but at this moment not with La Liga.
In the Copa del Rey, Barcelona has won 1-0, of course it is an important capital for Barcelona. But the Champions League, if you can win against Chelsea, then Real Madrid will face one of the best clubs this season, Man City or Bayern. So the chance to get the UCL trophy is also very small. Yes, it's possible as you said that Real Madrid will fail to win a trophy this season. And this will be a bad season for Real Madrid.
I see Carlo preparing young players for next season. He always puts young players first in every game. Even Toni Croos often sits on the bench. He always put Camaviga first, even though the midfield was often locked.