It is very difficult to make predictions about the World Cup final. Ronaldo is Portugal's main striker, so we think the team is very strong. But Portugal as a team is not stable. Their defense is weak. Moreover France, Germany, Brazil and Argentina are very strong teams. And so before the start of the World Cup, it is not possible to predict which team will be the champions this time
It is such a hard and difficult thing to win World Cup that even with one amazing player, you will not be able to get it. Not at their age, not when they were younger neither, it is near impossible task. You need to have a lot of great players, look at France for example, they do have Mbappe but they have other great players as well.
So in order to win this cup, you need to have players on all positions and you need to win a lot. Without that, you are not going to be good and you are going to end up getting bad results while one player would be scoring. Becoming a team and having a great generation of players all at the same time matters the most.