First of all, Real Madrid is the best Champions League team that has ever existed. So for you to say that Real Madrid might not even smell the Champions League trophy is a little exaggerated in my opinion. And I am saying that not being a Real Madrid fan. Because Real Madrid has been able to win Champions League trophies with not having a great squad before. And now that they have a great squad with a great striker, that chance is only going to increase, not decrease.
The La Liga is definitely going to be a walk in the park for Real Madrid. I just don’t see any team that has the capability to play on the same level as Los Blancos.
I agree with you on the fact about Mbappé though. he is a player who has had a sweet career so far. He was able to win the World Cup so early. He was able to get a huge amount of money from PSG so far in his career as well. I definitely believe that the amount of money has spoiled him. I hope the Real Madrid coach and authority will actually put him in his place and make him realize that he is not above the other players in the squad.
Real Madrid has great record in Champions League so it is hard to bet against them. They have strong team and good players so they have good chance of winning. But Champions League is very competitive and anything can happen. Mbappé is great player who has done a lot at young age but his success might have made him bit arrogant. Real Madrid coaches need to keep him humble and remind him he is part of team. Real Madrid will likely do well in La Liga but Champions League is a different challenge. Let's see what happens.