To be something other than completely unfair, even a Spurs fan should note that the Mavs don't have a problem "not sharing the ball", only that they do not shoot many of the spot-up jumpshots that rack up assists. Their offense is mostly a series of weaves leading to layups or midrange jumpers off the dribble.
But you are certainly right that Iverson is a chemistry problem waiting to happen for any team.
If it were me, I'd rather have Terry+Harris than Iverson.
Memphis would be a very interesting option, since it would give Iverson a dominant post scorer to play off of for the first time in his career.