Teams I see being clearly worse than us: Charlotte, Utah, Philly, Phoenix, Sacramento
Teams that may be worse: Orlando, Portland (if they trade Aldridge), Milwaukee (if they lose Jennings), Dallas (if Dirk gets injured or declines, they have little else)
Now that's assuming that Rondo comes back quickly and at full strength. If he misses a good chunk of the season, we could end up behind (or ahead of, depending on how you look at it), Phoenix, Sacramento, and maybe Charlotte. Without Rondo and Green for the entire season, we'd be in the discussion for worst team in the league, but Philly is also really bad and Utah is too (and plays in the West).
So by doing nothing (and "making sure Rondo's 100% healed"), we have at best a 15.6% chance of winning the lottery (if we finish with the third worst record). By getting rid of Rondo and Green, we might have the worst record, but that only gets us a 25% chance at winning. I'm not against trading Rondo if we get a young stud and/or a bunch of draft picks back, but just dumping him to improve our odds at the number one pick doesn't make sense to me when a.) it doesn't improve our odds THAT much and b.) there are several potential stars in the draft and we could get one with a top 7 pick without sacrificing Rondo.