I don't like Smith very much, but I'd trade Wallace for him. I don't think Detroit would take that little of a return, but any time you can turn dead money into a potential asset, it makes sense.
I would do this and agree on smith, antoine part II.
my main thing is getting love at pf, smith is NOT a small forward, he's a very athletic, running pf with a bad shot selection
i can see a team of rondo, bradley, green, smith and a very good rebounding defensive center IF smith can keep his shot selection in control

however that team would need to be tommy ball 70's style, run teams into the ground and play great defense to do anything