Everyone is in the 50's range so I'll play devils advocate and say the injury bug will hit some of our key players for longer stretches this season.
47-35
5th in the East
There is the possibility that Horford, at 30, has some crossings with the hated injury bug, and the team struggles in his absence. Also possible Isaiah has one of his seemingly annual lower back injuries after a fall following a tough layup, and misses some time at an inconvenient place in the schedule.
The team might also have some issues with inconsistency in bench scoring, after letting Turner go.
Even with all of those possible concerns, I'd be surprised if they finish significantly below 50 wins. But I agree it's a possibility.