Argentina are only gonna go downhill. They have no fringe players or young prospects that could come in and be great additions to the team.
Back after 2014 they had Dybala, Vietto, Kranevitter, Rulli, Correa, etc. as potential breakout players. Only 2 of them even became good players and none of them have had any role in the NT. Who do they have now who can potentially come in? Far fewer names and worse talents at that. If that generation of prospects couldn't do shit then this one absolutely won't.
And then you account for the fact that Brazil and France are in a golden generation so the next WC and Copa are just out of the question really. If Arthur comes good this season for us and is a starting midfielder for Brazil in the Copa, they'll have pretty much every ideal role filled to the brim with talent. No way can Argentina reconstruct in under a year to match that. Even Colombia look like a far, far better team than Argentina now.