I think the OP wants this trade to happen so every one else hates DA like he does.
Because why else would you make this trade?
If anybody says no to this, it would be Miami, NOT Boston.
Miami essentially gives up it's 2nd and 3rd best player for a point guard coming back from ACL surgery, an expiring contract and a raw, sophomore center.
Regardless, this trade is not very realistic because it leaves the Celts with no PG and Miami with two of them.
I think a more realistic scenario could be
Celts get: Chalmers, Bosh, Mike Miller
Miami gets: Rondo, Humphries, Melo.
And yes, I would make this deal if I were the Celtics.
I think Chalmers has become a decent point guard. Not as talented as Rondo, but getting a productive big in Bosh would be worth it (IMO.)
I also think Miami does this as they would love to pair Rondo with Lebron (could also convince Lebron to stay in Miami, having a top PG in Rondo.)