In a crazy bit of speculation that could be proven wrong quite quickly, I think Vinny Del Negro is fired Dec 16th. The reason?
The Bulls play the Celtics and Lakers in two of their next three games. They have no chance whatsoever to win those games. If they want to bring in a fresh era, then they want to do so when Bernie Bickerstaff has a shot in hell of winning some games, so that they can blame the whole negative culture thing on Vinny.
If they're going to get the team back and get any kind of bounce they need to establish some positive momentum, so bringing in Bernie with a stretch of winnable games on the forefront seems like the smart play rather than bringing him in and watching him get blown out a couple times early and leaving the players with the "well nothing's changed" attitude.
Sure, I could be wrong, in fact, I'm almost certainly wrong, but if someone were to offer me a million bucks to pick the day Vinny is fired I'd go with Dec 16th.
As a back up plan, Dec 13th seems realistic as well. The Bulls next game would be against the Lakers putting Bernie in a tough spot for his coaching debut, but there would be two days off between the Celtics game on the 12th and the Lakers game on the 15th. That'd give him a chance to run a few practices before starting up a game.
Place your bets below in the comment section for the Vinny Del Negro firing watch.