For one, I don't see SD moving Gonzalez and Bell before the deadline. They finished 2nd in their division and are improving. Maybe they take a step forward, maybe they take a step back, but if I was forced to bet, I'd say they will see where they are come June before making a decision.
Then, that's a lot of talent to give up just to get those guys one year earlier. I agree, Kelly is kind of blocked, and Rizzo would be if they acquired him as a FA, but Kalish looks like a guy you can consider a contributor to the 2011 and future squads. I mean, if you get Gonzo a year early it's to extend him right, but then you lose Drew and Cameron, and you only have Ellsbury and Werth in the OF moving forward. With an expensive IF (Gonzo at big money, Youk and Pedroia hitting the back end of their deals), a very expensive starting rotation, Papelbon hitting free agency, you are going to need someone contributing at the league minimum. Take away Kalish and you are left back on the market and over budget.
Don't see it happening.