I think Danny is a victim of his own success. He's been on the sunny side of two huge lopsided trades in the past (the first KG trade in 2007 and the second KG trade last year) so Danny probably couldn't get anything near value for Rondo because other GMs can see him coming and don't want to get caught with their pants down. I also heard that Jalen Rose say recently that he suspects Danny and Rick Carlisle are helping each other out as old time C's buddies, much like Danny and McHale did with KG. Only time will tell.
I'm a huge Rondo fan so I'm initially against the trade. But, I appreciate that Danny is just doing his job and he can't let Rondo potentially leave for nothing. At least Danny's smart enough to learn from the Lakers' mistake when Dwight walked away for nothing. Let's wait and see how the draft picks fall and how the meaty trade exception is applied.