Well, unfortunately I believe it's still too early to predict that.
Maybe the next star to shine competing against Mbappe or Haaland could still be in the U16, U18 or U19 category in some country in the world.
Unfortunately in Brazil it is very difficult to predict this, so far there is still no player at the same level or who has a bright future as Neymar, Brazil has excellent players, but unfortunately he is far from having that team of 2002 or 2006 ( Ronaldo, Ronaldinho, Rivaldo, Kaka, Cafu, Roberto Carlos and others)
Kylian Mbappé is just 24 years old. We can't predict what will happen in the next 10-12 years. However I am having a feeling that he is being unnecessarily overhyped. He is one of the most talented players in the world at this point, but is it right to compare him with legends such as Lionel Messi and Cristiano Ronaldo? He won the golden boot this time, but at the same time he couldn't win the world cup for his team. Messi on the other hand couldn't win the individual award, but he lifted the trophy for his country. Whose achievement ranks higher?