while I'm very much in the "espinosa is a shortstop and a waste at 2d" camp, I don't object to playing him one (and only one) season at 2d primarily alongside Desmond. It'll give DE a chance to establish himself as an MLB hitter. I don't want the change to be permanent. If it turns out we have two MLB starters between ID and DE, then we can trade one. SS is a premium position and to have two starters who are still making MLB minimum is a huge asset.
As for offseason moves, as a fan of both the Red Sox and the Nats, I like the idea of a deal built around Ellsbury and Willingham. Willingham would fit nicely into LF for the Sox, while Ellsbury could slide into leadoff for the Nats. Maybe get add in a middle reliever (Burnett, ideally, from a RS perspective) and get back another MI or C lower prospect. You do that, and find a first baseman (preferably LH power, but RH would be OK) and the line up starts looking better, I think. There'd still be room for one more OF upgrade here, but that could be a lesser FA or another deal.