Whether I would say that CONMEBOL dominates the scene completely is, even statistically spoken, probably wrong (given that it is 11:8 for CONMEBOL).
Though the statistics are still interesting when you take into account all the other facts like number of participants per association and so on. I didn't know all of that before in deeper detail, so it was fun to dig a bit around and understand it better.
Hmm.. yes. 2006-2018 period was completely dominated by UEFA. Both Argentina and Brazil suffered setbacks during this period, and were unable to perform well in the FIFA tournaments (barring the 2014 edition, when Argentina managed to finish as the runners up). But now the scenario is changing once more. European teams are getting weaker, as many of their top players are close to retirement (Ronaldo, Benzema, Müller.etc). Younger players are not performing at the same level as the senior players. But for Brazil and Argentina, the advantage is that their younger players are already performing well at international level - Lautaro Martínez, Alexis Mac Allister, Enzo Fernández and Lisandro Martínez for Argentina and Richarlison, Raphinha, Gabriel Jesus, Antony, Vinícius Júnior and Gabriel Martinelli for Brazil.
Yes the generational question also plays a role again and again. Spain is a great example for that. You could be wondering why they just won a single World Cup so far, but that was the time when they were full of superstars and won the EURO 2008, WC 2010 and EURO 2012. That was just crazy how strong they were. They are still not bad, but they did not manage to win another title so far.
Brazil has a team with lots of potential at the moment. Argentina remains to be seen because Messi was certainly still pivotal to their game despite his age. The whole role he took on and the burden he carried was big, but that doesn't mean he can't be replaced collectively. Not one to one, but collectively.
France is a damn strong team and we'll see what other European teams might make it to the top.