Squad depth is indeed an important factor for a national team to compete well in the world cup. Because if a national team has only a few star players, then what happens is that when the player is injured, the team does not have a replacement and it will have a significant impact on the team's performance. Having squad depth also allows the national team to divide their playing proportion, make good rotations, and tactics that can be adjusted to the players. And because of this, the European national teams can compete better, because they not only have squad depth, but also mature tactics and game systems as well as a supportive football infrastructure from the grassroots to the highest level.
I think that African teams soon will have more players available to be called up because more and more players born in Europe by African parents are choosing to represent their parents' national team. This for sure would affect more countries like France, Belgium, England, just to name a few, countries that usually rely a lot on players of African background.
The trend is like that, because to play at the European level they need to compete fiercely with other players and the exposure they get may be less, whereas when they choose to represent their ancestral nations, it can give them a better position and it can also directly help the country they defend to improve the quality of play and give them the opportunity to serve their country. Especially now that African countries such as Senegal, Morocco, Algeria, Nigeria, and several other countries are trying to improve the quality of their national teams..
. the presence of players of African descent might be able to reshape African national teams and make them even more qualified.