I just don't think Hinrich is talented enough to justify the contract, nor is his shooting as good as some think make him a nice fit next to Wade. Wade has good defensive skills and gets to the hole as well as anyone, but he's not a shooter, and you wear him out ALWAYS having the ball in his hands. Additionally he's a bit small to man up some of the taller SGs in the league. The heat should look for a backcourt team mate who can handle the ball enough to take pressure off Wade, catch and shoot, and has above average size/strength to play D on some of the bigger SGs when needed. Additionally, the PG has to be able to exist as a secondary offensive figure. Hinrich fills some of those, but I just don't see the over all talent or perfect fit that would justify absorbing that contract.
There's proabbly a deal that sends Marion in a sign and trade to LAL that would work for MIA, but I can't think of it.