Per ESPN.com (Insider):

Based on their estimated "true talent" (as described last week), remaining schedule and performance to date and with a healthy Rose factored into more than 1,000 simulations of the season, Chicago averaged just over 52 wins, the third-highest total in the Eastern Conference, after the Indiana Pacers and Miami Heat.

Without Rose, that changes in a hurry. My SCHOENE projection systemestimates that over a full season, the Rose-less Bulls would win approximately 37 games. While the oddsmakers disagree -- Jay Kornegay of the Las Vegas Hilton told Insider his line for Chicago would be 48.5 wins if Rose did not play all season -- there's reason to believe in such a pessimistic outlook.

At this stage of the season, they settled on 40.8 wins. Ouch.