If he's deciding to stay, then he's i can't see him ever leaving. The presidential elections are in March next year, the next president will give him the key to the city and everything in between to stay. He'll be pretty much 34 by then.
Barca are in deep shit with finances, that's the reason they've let Rakitic go for fuck all and Vidal is also on his way out. Talk of Suarez going on a free just to get him off the wage books pretty much shows that. If you look at their squad for next season, Barcelona are in deep shit with or without Messi.