I also saw a lot of news about this. Mbappe is not happy for Messi to come to PSG. But I do not understand why he is not happy. We all knew Ramos was Messi's enemy. Ramos has no problem befriending Messi, but it's seem Mbappe is not interested in building a friendly relationship. This is good news for Madrid if Mbappe goes to Real Madrid. Barcelona is not very strong now, Real Madrid may be able to win the title.
Ramos offered a house for Messi to stay on it if he doesn't want to stay at the hotel, nice and unexpected move 
For Mbappe, he is trying to prove him and shine, be named the "savior" and the hero of the club. I am not criticising him and I am exaggerating a bit of course but he has the right to looked at as Dortmund's fans looks to Haaland. In PSG he is kind of stuck with the level of Ligue 1 gameplay but with Real Madrid, everyone will count on him, maybe more than Benzema and of course we all know how Real Madrid is rated and what's mean being their best player. I still prefer to see him playing with PSG this season.
You're right, if Mbappe goes to Real Madrid, the team will probably become much more dependent on him. But has Mbappe been experienced enough at the moment? That he will be able to take charge of the entire club? Big clubs like Real Madrid definitely need experienced players. Mbappe is a very talented and extraordinary player. But he still lacks experience. We have seen how he has performed for France in the Euros. Benjama has played much better than him.