I think this trade would make both teams worse, frankly.
OKC needs Westbrook to help carry a starting lineup that contains poor scoring threats in Perkins and Sefolosha. I don't think Rondo has the pure scoring ability that Westbrook does, which is what OKC needs.
At the same time, Rondo has better court vision, passing skills, and insticts than Westbrook does. I think he's better on our current team, and I think he'll be better directing a balanced offense.