So you trade an impact player (who's easily retainable)
Where is this assumption coming from? How do you know Rondo is going to be easily retainable? Heaven forbid but a team may sign Rondo to huge money in 1.5 years only to have him rapidly decline due to knee or other injuries. If you decide to go all in on Rondo, there are risks (as there are with trading him). He could also go for greener pastures and end up on the Lakers (for example).
As for the deal, wow, I think it is a great deal for us. I have not seen McLemore play in the pros so my comment is based on the assumption that he is playing up to the potential of a top pick (which was stated above).
I agree that we don't really need more draft picks but they do have value. They may help us get someone like Asik. There also seems to be some confusion about Wallace. I am assuming they are taking Wallace back. That is how I read the deal.
Rumors are rumors but with what Sac has done lately, this just may be true. Say we flip the two picks plus Humphries for Asik, that would be:
Asik, Mclemore, I. Thomas, Thornton, Thompson
for
Rondo, Wallace, and Humphries.
We probably have to cut Pressey and Brooks (oh well).
So yes, I do this.