Your prediction makes total sense and that is what is most likely going to happen. I don't see high possible changes on this classification that could bring teams outside the top 4 to these positions. Uruguay and Ecuador look solid where they are, while Brazil and Argentina don't need comments...
On the other hand, Peru can still get lucky to manage a draw against Uruguay and then win their another game against Paraguay, expecting Uruguay is going to lose against Chile or draw at least. This way Peru can reach the fourth position. In a scenario like that, Peru would hit 25 points against 23 or 24 for Uruguay.
This is the best of all scenarios, but I start from a point, how can a country like Colombia, where they have every chance of qualifying, make such a mistake for a world ranking? They achieved a lot and lowered the level at the moment when they least had to do it? Now Peru is a country that can easily go to the playoffs, but Chile is also fighting for it, so the only way for Colombia to qualify is for a miracle to happen and for some scores to happen in a few games, which seems almost impossible to me.
Argentina will play a lot of great in this year's FIFA World Cup. I think they will win the World Cup this year because you know, they have all kinds of players this season. And, yes, Brazil also have a lot of good players who can get second place, I predict.
You know, Argentina and Brazil both have games against very weak opponents which means they have a good chance of winning the game in the top 4, it won't be a problem for them. The final match of the 2022 World Cup in Qatar will be very interesting for which the whole world is watching.