its all about messi's legacy. they are willing to ruin their careers for this world cup. its now or never.
i bet a lot of it also is that the argentine players dont wanna be seen as the ones that let messi down, they dont want in years to come to be looked at as shit because the best player of this era couldn't win a world cup because they was not good enough.
since pele the best player of the era has won the world cup. pele, maradona, zidane..its messi's turn now and if he cant do it as good as he is then fingers will be pointed at the rest of the team.
this is a better chance than when they actually got to the final. theres no standout national team now it seems. no german machine, an 'average' brazilian side compared to what they are used to. the french dont seem as potent, italy nowhere to be seen. belgium's golden era fizzled out as they lacked quality up top and still do. this is messi's golden chance, and hes in unreal form at the moment.