personally i do believe he will re-sign:
one of the factors i look at is how confident barca are of getting it done, theyve said through reliable journos that a deal has been reached and that the reason he hasnt signed is because of how much shit they are in in terms of their wage bill, and i find that if messi does join a different club, it will be for that reason alone, they are unable to clear enough of the wage bill to sign him (people close to messis camp a few months ago stated that messis desire was to continue and theyve been in negotiations since then). if messi does leave and this "barca confidence" turns out to be a fallacy, then i'd be very impressed since their pr has managed to calm the world over thinking that messi will still be in contract with barca for the coming season, which brings me onto my next point
no one is bothered about whats going on here, sky sports arent going crazy about it like last time, other outlets such as talksport etc dont seem to be interested, i find that the consensus is that he will resign and so theres nothing really to cover with it, i mean think about it, the best player in the world or arguably the best the game has ever seen, is out of contract and theres no news outlets pouncing on it at all??? just a few articles from sky sports saying that barca and messi are in advanced negotiations blah blah, to me it just shows that everyone who is actually ITK concerning this believes that this is barcas to lose
now saying all of this, things could change massively if there isnt any major developments in the next few weeks, most notably when argentina finish the copa, whether winning it or getting knocked out, if theres radio silence from messis camp a few days/a week after that, then for me things change, this also goes for barcas outgoings and whether they can lower the wage bill, theyve started to get the ball rolling on it and seem confident enough to manage it