If we go into next season expecting Adam Dunn to be the everyday first basemen, we'll be regretting it by the beginning of May.
I'd rather resign Nick Johnson because, if the offseason transactions are handled properly, we'll be in the market for a first baseman. There is no one in the system, including Adam Dunn, ready to play first base in 2010. If we trade Nick Johnson, that's makes him unlikely to be the one we sign for next season because players typically don't come back after they've been traded.
I'd like this team to think "big picture" but, I'm afraid, they won't.