I really agree with your statement that Mbappe really suits Real Madrid's current style of play, but does Carlo Ancelotti want Mbappe in Real Madrid's current line, that is my question if Mbappe really wants to play in La Liga.
Mbappe is a brightest star player and he can self create chances, not like Haaland. His playing style is more beautiful than Haaland who is a traditional striker. I am not a fan of Mbappe by my opinion on Mbappe and Haaland as described and I like Mbappe more than Haaland because of their playing styles.
This is just my speculation, if these two players are still at Real Madrid then it would be very appropriate if Mbappe were brought in next season, because this figure is the one who is able to provide mature passes relying on the speed that Mbappe has, Luka Modrić and Toni Kroos are figures who is capable of providing mature assists, if Mbappe is used as a machine to pound the opponent's goal, then get ready it will be a frightening threat for La Liga clubs and European clubs.
Luka Modric is very old and he has helpful skills plus his experience, all makes him is a useful player but we already see his playing time for Real Madrid drops a lot in this season. He will have to accept a substitution position in Real Madrid if he wants to stay in Bernabeu as a player. Kroos is younger than Modric and can play some more seasons for them.
Real Madrid already prepare for their future without both Modric and Kroos and I believe their decision to buy Mbappe is not dependent on future of Modric, Kroos.