The next World Cup winners from a different continent won’t come from Asia or Africa, rather North America
Mexico my clear favourites out of the 3 teams that are big powers in CONCACAF. USA is also developing great talent slowly but surely, the MLS is fairly new as a league so I think it is possible. Plus the MLS includes 2 Canadian teams as well, and Canada, despite having less of a talent pool than the other 2, seem to do pretty well with what they have and either of these 3, if they go on a dark horse run, could honestly see one of them get to the final 4 and from there its anyone's game.
It might take a couple of decades to get there but I bet on one of them making it there. The problem is Africa is mostly reliant on one NT, Morocco, as their main favourites most tournaments with others behind being Senegal or Nigeria, the latter didn’t even qualify this year.
Same with Asia to an extent, Japan clear front runners for their nation, followed by some pretty weak teams.