Fortunately, whenever I've been there I've always been on foot, so the parking issue isn't an, erm, issue for me.
From a non punting point of view, I think it will be good for Leeds, and good for the Dock area which appears to be a massive white elephant really.
From a punting point of view, will it stop me going to the Docks? No...but if more people are in the area it might get trickier to make appointments with popular girls.