I thought this team could win 35-40 games depending how quickly and completely Rondo returned, which would give them a chance to make the playoffs, since I bet a team with a losing record will make it from the East. My expectations are somewhat tempered, but I still think if Rondo comes back at the end of November/beginning of December this team can get to 35 wins. There are a lot of bad teams this year, especially in the East, and many more mediocre ones, whom the Celtics should at least be evenly matched with once Rondo is on the court.
Mind you, 35-40 wins is sort of an "if everything goes right" kind of ceiling, so if there's another key injury, or a player like Olynyk or Wallace isn't as good as I hoped, then sure, I'd expect less. And I won't be surprised if that happens. But given my current knowledge of the team and hope for Rondo's return by December, I'll stay at 35-40.