Argentina is in trouble for Russia 2018. AFA is responsible for the state of Argentine football due to their disorganization after the passing of Julio Grondona. That includes the youth teams that were under the tutelage of Julio Grondona Jr, the son of the deceased head of AFA. He had no idea what was he doing with weird views of football.
Under Tapia, the New President of AFA, things have turned around. They just hired Jorge Sampaoli, but he only had a few days to practice with the new lineup with a renewal of players. It takes time to make the team behave as a unit. A "Team" is always much more valuable that the sum of its individual parts. Today, Argentina is just good parts not acting as a team. As I said, it takes time. Unfortunately, it might be too late for Russia 2018.