How does this suggestion make us better?
We're trading our starting point guard for a second small forward, which doesn't seem to help our roster balance any.
So when I come up with a trade idea, I always think: what would get us closest to title contention fastest. The recipe for title contention seems to be: three great players, and at least two of the following: (a) great defense; (b) an amazing rookie; (c) a terrific bench.
Rondo is not a part of that calculus, for us - because he will depart in free agency anyway. We have too many players, and will soon have to consolidate: many so-so players and draft picks for one much better player. Deng and Henson help us with (c) insofar as they provide a better bench.
We can't field a team with Olynyk, Sullinger, Zeller, Smart, Bradley, Green and Young and really do anything. Of those, only Smart and Young really have potential to be great players. And they won't do that unless they are surrounded by some smart veterans. It's no accident that players without role models early in their careers don't end up being successful players: Pervis Ellison never really played with anyone good; Derrick Coleman learned at the heels of Mookie Blaylock, and the "technician" Jed Bueschler.
None of our guys will develop without leadership (which Walter McCarty is not going to provide). And Jeff Green is not going to develop. He is the player he is: wildly inconsistent.
Deng is more than just an "asset" he's a guy who knows how to play. And - he's a guy other guys want to play with. If you want to Joakim Noah - you've got a way better shot with Deng on the team. A long range plan requires guidance for the youngsters.