There's nothing left for Davidson to prove in AAA and he already played 30 games in MLB and looked rather competent. As for Dunn, you keep him unless you come across a trade that costs you in little money and/or brings in real talent. He serves an important role on this team, which is being a useful hitter that hits left-handed and can keep those three righties from being slayed by RHP late in the game. While we're not going to blow our wad trying to win in 2014, you don't actively make the team worse for no particular reason.