I think if they want to maximize their return and be as good of a team as possible, Miami should trade Wade. Lebron is too good offensively to not run an offense and Wade doesn't compliment him well enough.
Last night I discussed Miami trading Wade for Billups, JR Smith, and a first round pick. I think they'd be getting far less in return for what they are trading away, but I'd argue that they'd be a better team this season. Unfortunately, Chauncey only has a few great years left in him while Wade has many.
I think Paul, Ariza, plus something for Wade and Arroyo would be a great trade for Miami.