Even without Messi, it doesn't mean Argentina can't win the World Cup in the future. There are many young Argentine players who can become good players, for example Thiago Almada, Julian Alvarez. even though they are not top stars players like Messi, but in the future who knows they can lead Argentina to win the World Cup.
It is very hard to speculate on the future but looking at this current Argentina team I don't see them even progressing beyond group stage without messi, if you look at Argentina record with and without messi the stats shows they hardly win matches without him. Argentina have always been a country that relies on individual brilliance that's y there greatest success was during the time of Maradona of the blessed memory and subsequently now with messi. If Messi do retires after this then Argentina will pray to have a player with same characteristics of these but without that then it will be hard. I am not disputing the fact that there exciting players coming up but Argentina doesn't do well as a collective team.
I believe those Croatian players will surely be disappointed in themselves, there is nothing bad to lose to a good team like Argentina, but to lose 3-0 in a world cup semifinal is embarrassing, and i am sure they know they let down millions of their fans that were watching back home in Croatia.
Although Croatia were bad yesterday at defense and attack which resulted into the heavy defeat but they have every right to raise there head up because they have done well. These current set of Croatia players needs to be idolised and given a national award. A team been so underrated going to a back to back semi finals isn't just luck but share brilliance and determination that only deserves maximum recognition.