It's a thing of debate because we all know that the Argentina team unlike teams like Spain, Germany etc, it's build around one player as a motivation to the trams doing better at any competition. If you do a self stat on all the games Argentina has played with Messi as their top star you will discover that in any of those games when Messi isn't at his best the Argentina team doesn't do any better too. Hence my questioning of the future of Argentina. While they may not perform that badly in my speculation it's true they are likely not to make it in top three most favourite countries to win in next World Cup tournaments.
I don't think maybe there will be any team that will have a player like Messi that will not like to build the team around him. And the fact is that it's not that the Argentina team fully relies on Messi. But the point is that the type of player Messi is, is what makes some people feel that the Argentina team fully relies on him. And even if Messi is no longer in the Argentina squad, they will still be playing well, but there will possibly be differences because Messi is the most important player in the Argentina team. And it's not possible for a key player to be out of a squad without it affecting the team.and every team have their own most key player and when they are not in the squad it will definitely affected the performance of the team probably when they are not in good form it will affected the team.
In some matches during this World Cup, I felt like Messi's job was to distract defenders and make space for his teammates to easily enter the penalty area and attack.
I think all of Argentina already knows that Messi won't be playing in the next World Cup, and they'll be building their team to maintain their strength.
After all, the Argentine national team features players from a huge number of top clubs:
Emiliano Martínez Aston Villa
Cristian Romero Tottenham Hotspur
Lisandro Martínez Manchester United
Nahuel Molina Atletico Madrid
Alexis Mac Allister Liverpool
Enzo Fernandez Chelsea
Julian Alvarez Atletico Madrid
Lautaro Martínez Inter Milan
This is a team of big stars who could still be competing for the World Cup in four years.