It would suck the largest balls on record to lose Fifita, no doubt about it.
BUT it is hard to imagine him having a better season than last year, so anyone who signs him now is going to pay through the nose. Not to say he's not worth it, but they're paying for a player at their absolute top of their game. Not really the ideal time to be buying a player who is not going to get any better.
Couple that with the fact Fifi is likely to be a blue for the foreseeable future, so that's 3 games he will be missing for from a season.
I wonder how much Fifi will be thinking about Dougy and Snowden. They are a lot further away from a Blue Jersey now than when they were with us...