That Denver trade idea just occurred to me, too, so obviously I'd be intrigued by it.
If we were trading with Utah, I would expect to get back Al Jefferson or Paul Millsap. Any Rondo trade that doesn't net us CP3 needs to get us a very significant front-court upgrade.
That's why I'd consider the Denver trade, because I think it might make us better this year. A trade for Devin Harris + Al Jefferson probably wouldn't, but I'm not sure.