The problems thus far with Bron/Wade pairing on offense isn't so much the ball-dominance: it's that neither can really bring out a dimension in the other's game, cover up the other's weakness or make each other's lives easier other than absorbing some of each other's scoring burdens to free up energy for defense.
CP3, though a ball-dominator, would complement one of them much better than they do each other. Teams have to extend their defenses against a CP3 pick and roll/pop because he's so deadly pulling up for the 3 or the mid-range J, creating a lot of slashing opportunities for team-mates against a stretched D. They'd also have to respect him more as an off-ball shooter. And they could even run pick and rolls together, much like Rondo and Pierce do.
Their defense would be a lot less daunting without the Wade/Bron pairing on the wings though.