Real Madrid will be very hot next season just because of Mbappe's presence, but that doesn’t mean the Champions League will be easy for them. Just like you said, next season will be the last season for Guardiola at Manchester City, so he will do everything in his power to win the Champions League for the club before leaving, and we know Manchester City also has a strong squad. So I can’t really say Real Madrid will win the Champions League next season, but I know the season will be an interesting one that everyone will enjoy.
I’m also not expecting Real Madrid to win the Champions League next season because Manchester City and other clubs who are even tougher than Real Madrid are going to be fully ready for next season's Champions League. I believe next season will be a hot season, and again, I'm expecting Real Madrid to do more than they did last season because of the beast they have in their squad Now, Mbappe is a very talented player. He can do everything in his power to get the visibility he wants in Real Madrid, but what I’m also doubting is the trophy for the Champions League next season. I think it will be difficult for Real Madrid.
Man City, Bayern Munich, Arsenal, Liverpool, Leverkusen, Dortmund, Inter, AC Milan and several other candidate teams will continue to be obstacles for Madrid. But regarding probability, of course Mbappe arrival is a plus point, but as you said, that doesn't mean Madrid will easily win the Champions League trophy next season. For me now I am looking forward to how far this club will prepare itself to give its best.
Football sometimes brings unexpected surprises that cannot be avoided, although currently many people favor Real Madrid, but the surprise of an injured player can always be a big problem.
Just look at how Manchester City looked at that time after getting the UCL but Kevin De Bruyne suffered an injury, making the club's performance in the following season less than optimal.
A problem like this could happen to any club, Real Madrid, which looks very strong, could also suffer the same fate.
I don't expect that to happen, but at least we shouldn't have too much hope for Real Madrid because even though Mbappe's arrival currently provides additional value, we haven't seen how he looks with Real Madrid.
Manchester City is currently still very ready and could easily beat Real Madrid again.
Haaland is still Pep Guardiola's mainstay and as long as these two important roles are still with Man City, they will remain the strongest club after Real Madrid.