Why trade Rondo and Pierce for Mo Williams, Bledsoe, JJ Hickson and Ryan Gomes? Is it for more cap flexibility?
Anyway, the answer is "no". I wouldn't do that trade.
Not trading Rondo for cap flexibility and would be very reluctant to trade Pierce for straight cap space. I would be looking to get some more talent in return for Pierce and would only trade Rondo for high level star (established star or potential to become a star).