Eakin hasn't really shown too strong of a learning curve on faceoffs, and while he's defensively responsible he has yet to prove himself capable of shutting down quality opposition forwards. Kesler has proven to be an ace faceoff guy, a shutdown center, a beast on the PP, and a quality 5-on-5 scoring forward. If you get two quality years from him and you make the playoffs both years I would argue that the tradeoff of losing a semi-cost controlled player for him is worth it.
Do I love the idea of trading Eakin? Of course not. I just think we should be realistic with his qualities and projection. I'm also of the opinion that you can mix short term with long term goals. I'm not saying to trade the farm for a slew of 27-32 year olds. But I think you have to be willing to pick and choose targets.