Not really. Dinwiddie is expensive and a very questionable fit. The two bigs are fine, but I'm not sure they'd be in the rotation. Maybe they'd steal a few minutes from Grant, but he hasn't really been the problem, and it's only a few minutes because he spends most of his time at the PF these days, where Harrell and Bryant should not play. They'd be upgrades over Kanter, but that's expensive injury insurance for Al and Rob.
Maybe there's a team out there that likes Dinwiddie more than we do, and has something that we might like more than the Wizards, enabling us to somehow get involved, but I don't see much out there.