Mbappe has already lost some of his golden years at PSG, but he is still young and he can turn things around. In addition, he already has an amount of money that is difficult to count, and in general he has everything except satisfying his ambitions. Mbappe looks much more focused on football than Neymar and I don't fear for his career in that sense.
I guess I would agree with everything you said but I would like to add one thing that I believe could come into play when you talk about the amount of money that Mbappe has.
The clubs from the SPL are entering new spheres all the time, which means that a player who says "ok, I now have 200 million in my account, I will decline any offer as I am rich enough and will only pursue my career". Then the sheikhs pass by and say "you got 200 million in your account, we'll make it a billion". So these offers are not about doubling the wealth, but they are about changing life once again even for people who couldn't supposedly have been any luckier in their lives. When he got a billion and the contract expires, the sheikh might say "I am going to turn your billion into 5 billion if you sign a life-long contract with us. No? What about 10 billion?".
It is so weird what they are doing financially that I would not be 100% certain that Mbappe would decline every offer that is catered to him.
Yes, the sheikhs bring some element of madness into football and it is almost impossible to predict (with reliable accuracy) what will happen. As the saying goes, if a person cannot be bought with money, then he can be bought with big money
In general, the modern world is like this (rather strange) - you can work all your life and not earn anything, and someone who shoots a couple of successful tik-toks will fall into a trend and become a millionaire in a very short time. Therefore, the crazy money that football players receive now is more or less logical - after all, they give their whole lives to football (maybe except for Neymar, haha) and are not just lucky.