I just don't see the benefit for Atlanta. Now if perhaps there was a third team involved like say Cleveland, something like this may be possible
Boston - Smith at 4 years, 80 million (or something like that)
Cleveland - Green
Atlanta - Varejao, Sullinger, Crawford, Melo
I think that is a more plausible trade and one that all 3 teams might do.
4 years 80 million??? Please god no! Moving Green and Sully (not to mention Crawford and Melo) to pay Smith 20m a year? Green makes 9m and isn't that far behind Smith in terms of overall talent. I know you said something
like that, but I'm only in on Smith if its for about 5m less a season (so 4 years 60m and would be willing to extend the deal for significantly longer, 6-7 years at around that 15m number).
He would have to be taking a significant cut from his market value, but his market value is going to be extremely inflated by desperate teams. But he might be inclined to do that if he gets to play with Rondo on a solid team (plus it sets a good precedent for when Rondo comes off of his team friendly deal).
If we are moving Green and Sully I want huge value in return, as in not what Smith would be making if we were highest bidder in FA.