That Argentina team were nothing but bottlers who couldn't handle the pressure put forth on them by the federation. Messi and Mascherano were the only ones who could. So many under performers.
If anything, Messi dragged that team to three consecutive finals (WC 2014, Copa 2015, Copa 2016). You need luck in cup competitions and Argentina had zero. Only Messi.
Dybala has looked horrid for the national side. With or without Messi. Messi also isn't the reason why Icardi isn't in the team. It's because of his ego and lifestyle/baggage. NO ONE likes him and his wife is hated in Argentina.