As Adam Cooper recently pointed out, “it’s worth remembering that it’s dangerous to second guess what Alonso might do”.
That said, it doesn’t make sense. Raikkonen is leaving Lotus because the team cannot “get things sorted”, namely, their financial situation is still not secured. Why would Alonso, whose only goal is to win the world championship, join a team that probably won’t even be fighting for race wins next year?
Moreover, Alonso’s recent statements don’t indicate that he’s even thinking about leaving Ferrari. It might happen some day but I don’t think he’ll jump ship as early as 2014.