My take on it is the Raikkonen offer is to replace Massa, not Alonso. That's if it's even true. Yes I certainly think Alonso should stay at least for next year, Ferrari have as good a chance as any to prove to Alonso they have a grip on the new rules and can give him a car to win races.
The only problem with that is if the Ferrari is a turkey again next year Alonso's options in 2015 are going to be more limited, the Red Bull seat will be gone unless as I said before Vettel does a swap with him. He'd have to look at whichever team is up there although of the current top teams back to Enstone F1 for a third time seems the only possibility. He likely wouldn't go back to McLaren even if they were performing well and a seat is unlikely to be available at Mercedes.
The only problem with that is if the Ferrari is a turkey again next year Alonso's options in 2015 are going to be more limited, the Red Bull seat will be gone unless as I said before Vettel does a swap with him. He'd have to look at whichever team is up there although of the current top teams back to Enstone F1 for a third time seems the only possibility. He likely wouldn't go back to McLaren even if they were performing well and a seat is unlikely to be available at Mercedes.