You are right, there is no end to the talent of players from these two countries and it should be admitted that even now both of them are still very dominant in the world cup competition. Maybe we will continue to see new talents emerge in the next few years so that the quality of players from Brazil and Argentina will continue to increase. Pele and Maradona will forever be examples of world cup success and this will continue to be passed down for generations. Samba is indeed the original identity of Brazil and it's only natural that we will see the jersey worn by Brazil at the 2026 world cup.
Both countries can continue to have players with good skills because football is the main sport in these countries, and we can see lots of players from both countries having careers outside their country or continent. Especially for Brazil because it is filled with many players with good skills, the competition to be able to become national players is very tight, only those who are considered capable of making a contribution are called upon to defend their national team even though the club is not that good but they can still become the national team as they are Richarlison experienced this where he became a team member of the Brazilian national team even though at the club he was often on the bench, not fun for other players who might be better off just playing at a club that is not so well known.