This is a question that many football fans are asking themselves. The answer to this question is not simple and there are many factors that need to be considered.
First of all, Mbappe is a young player who has been playing at the top level for only one year. He has been playing well and he deserves his chance with France in the World Cup. There were also reports of Mbappe being unhappy with his game time at Monaco last season which might have affected his performance for the French team in Russia 2018.
Secondly, Real Madrid have been struggling in La Liga this season and have fallen behind their arch-rivals Barcelona. They are also struggling on the European stage as they lost to Ajax in the Champions League quarter-final round and lost to Liverpool in the UEFA Super Cup final this year
Thirdly, Mbappe's agent Mino Raiola has close ties with Juventus who might be interested in signing him next summer if he continues to impress for France Also you can read this article:https://www.bzi.ro/ce-s-a-intamplat-cu-mbappe-si-real-madrid-4542635