You see, that's the thing that will keep Sand from being banned. The Pokemon need an ability to boost their Rock, Ground, or Steel attacks OR an ability that doubles their speed. Water types with Swift Swim get double speed AND naturally have their STAB attacks boosted... At the same time. Pokemon that benefit from Sand only get to pick one.
Sand Power and Sand Throw are just neat offensive boosts to Sand, but nothing groundbreaking. Let's be honest though, we can't say anything will be groundbreaking until we start playing the BW Metagame.
Though yeah, on paper Sand Throw Cacturne could potentially boost up to UU, and find a niche on OU Sand teams. 115/115 offensive stats are nothing to scoff at, especially when his horrible 55 speed is doubled. Though Sand Veil can be useful for getting off at least 1 Swords Dance, if he can pull it off and get +2 attack then he can try to sweep with Seed Bomb. I still see Focus Punch/Sucker Punch/Swords Dance/x being his most effective set though.