True, Do you think Messi will come back to the National Team?
Yes. I think he was just so upset at another title loss, and also totally fed up with the disastrous Argentina team organization, and at that moment he'd had enough.
Also, I think it was the only bargaining chip he had to try to force change in Argentina's management. If he was ever going to be willing to come back, they had to get serious about making changes. His public announcement of leaving was the best way to make things happen.
He loves playing too much to give up. I'm reasonably certain we'll see him in Russia in 2018.