I don't love the idea, but I could live with it. I feel like Rondo should be worth more than that, but we have not exactly been overwhelmed with offers for him. Henson could hold down the center position for a year allowing Sully and Olynyk to play more time at PF helping their development. We would likely be back in the lottery again and perhaps have two lottery picks, plus the Clippers and Philly picks which could help us move up. As Future Celtics Owner said, there are a lot of centers in next years draft. Okafor is projected to go 1 or 2 and Towns 4 or 5, and there are a few decent consolation prizes. One more year of misery and we could have a nice looking team with the Brooklyn picks and cap space in tact.
Next year we could have a roster of:
Smart, Pressey
Bradley, Young
Wallace, Young (I think Green will opt out)
Sully, Olynyk
Okafor/Towns/other, Henson