central pieces of the Spanish NT) will be older, slower or not playing.
Barcelona: Thiago Alcantara, Cesc Fabregas, Jordi Alba, Sergio Busquets, Gerard Pique, Pedro Rodriguez
Real Madrid: Sergio Ramos
Manchester City: David Silva
Manchester United: David de Gea
Chelsea: Juan Mata
Bayern Munich: Javi Martinez
Kids from FC Barcelona: Deulofeu, Montoya, Bartra & Isaac Cuenca
Random line up (4-3-3):
/*
-------Pedro - Fabregas - Mata--------
-------Thiago - Busquets - Silva-------
----Alba - Ramos - Pique - Montoya----
-------------David de Gea-------------
*/
They all have the same age or are younger than Messi. They are all world class, playing in the best teams except the "kids" that still have 6 years to improve and shine.
Spain will obviously lose a few key players such as Puyol, Iker Casillas, Iniesta, Xavi & Villa, but they already have nice replacements that are top players and still have a few years ahead to gain experience and get better in the next 6 years for the 2018 world cup. There's also a high chance that Spain will get new players obviously in the meantime.
Messi "the midfielder" (too old to be the great striker he is right now) won't be enough against that "basic random lineup".
In my eyes, there's a tiny chance for Messi getting a world cup. I just hope he gets better and gets all the records he can in football. IMO he should forget about the world cup, it's pretty much mission impossible. As a few said already, the only good thing from Argentina is their attack front, nothing else. Spain always dominated teams because they have a great midfield. In 6 years they will still have a great midfield... but also a great defense, a great attack and a great goalkeeper... lol.