Its a great idea. It really is. But it'll never happen.
I cannot imagine Cuban dealing Dirk, and to L.A. in particular. I think there's an emotional attachment there that will preclude moving him on. I think, instead, he'll look to add an all-star piece beside Dirk using, in particular, Dampier's non-guaranteed contract and perhaps Beaubois.
The deal is perfect for Toronto. They get Bynum who can play inside leaving Bargnani to play the stretch-4 position he's best suited for. And because Bargs can defend the post pretty well, they're not too soft on the inside.
The real wild card here is Bosh. He's going to pick where he wants to play. He seems disinterested in playing in his hometown. If I was a betting man, I'd say he goes to L.A. straight up for Bynum. With Miami/New York being the next tier of likely destinations.