From a fan's perspective trading Wallace is part of the turning the page package, but should it be? I think there's a good argument to keep and resign Wallace based on two things. The first reason is chemistry. Good teams have to have a consistent stable of players that get to know each other and evolve together over time. Look at how much better, Wade, James, Bosh with a couple healthier role players are this year than they were last. Same for OKC. The Spurs always have Duncan, Parker, and Ginobilli.
Second Wallace has been playing better as of late for undoubtedly a myriad of reasons including but not limited to health. Perhaps a convincing argument for his better play is, he's undergoing an evolution as a player. When we traded for him he was a top two option on a bad team. Since then we've learned his skill isn't refined enough to be a top two option on a good team. Add to that he is an energy player that has undoubtedly dropped a notch in energy has he's aged. Against Washington he didn't have high assist numbers but he put a lot of pressure on the D by posting and passing out of the post. The kind of pressure that gets easy looks for other people. The kind of pressure we don't get a whole lot of. Against Minnesota he had 9 assists. Is he evolving into a player that makes everyone else around him better?
If so Wallace might be the kind of core player that makes us legitimate long before any long term rebuilding efforts could. Specifically in a scenario of addition by subtraction of a couple other players and the development of Williams, god willing he's okay.