You are being a bit too optimistic about Real's chances for the new season. With the way they played against PSG, they might not even reach the final. Because with that kind of defense, you cannot expect good results. Although on the other hand, their main defenders might still find their form and everything could change. But for now, I do not see any big improvements in Real's defense. Of course, they will always set the highest goals for themselves to reach the Champions League final and even win it, but for that they need to strengthen their defense. And actually, PSG did not manage to score a single goal despite such a strong attack, so that is also something to pay attention to.
That is true, but they at least saw their mistakes and their weaknesses quickly, which is the important bit about this. They saw that they are not doing a great job, and because of that I am sure that we are not dealing with anything great at the moment, and they believe they can fix it as soon as possible. If they can do that, then they are going to end up with great results and shouldn't be that tough. I get that it may not be great at the moment, but that doesn't mean we are going to see changes that quickly.
What Real needs is time, and they have that, we are not even in august, and if they can train and get better and adjust, then with Xabi they can have a whole new way of playing and could figure out how to get better results.