Exactly. There's no need to suggest any sort of roster overhaul, much less the thought of jettisoning one of our big three. Besides, you don't simply change out 3-4 players on your roster and expect "instant soup".
The Spurs simply need to seek to add a complmentary, reserve big, who can defend, rebound, and is a threat to score down low. I know that's a tall order because practically every team in the NBA needs such a player and the Spurs have litttle to no trade assets. A tall order, but not an impossible one. Collison isn't the ideal fit, but if he is the best they can get come the trade deadline, I'll take him. It's the frontline where there is the biggest deficiency right now. In order for the Spurs to improve their chances of advancing in the West, Tim desparately needs help.