Well, I've stated my opinion before; I'll restate it here.
I think that Sand Veil / Snow Cloak should not be banned outright, because many of the Pokemon that have those abilities (the main ones being Cacturne, Garchomp, Froslass, and Mamoswine) are not widely used. Also, while those abilities can be considered 'haxy', there are many times that the ability will never come into play, and the Pokemon need the right weather in play in order to effectively use the ability.
Also, certain Pokemon are affected in a negative waywhen Snow Cloak / Sand Veil are banned. Froslass loses out on the moves Spikes, Disable, and Trick while Cacturne loses out on the moves Focus Punch, Drain Punch, Giga Drain, and Switcheroo. (I'm assuming that the Pokemon can't have dream world abilities with egg moves; if i'm wrong, please let me know.)
My opinion is this:
Ban Garchomp from OU altogether: Garchomp has stabbed Dragon and Ground moves, a great attack stat and good speed stat, and decent defenses as well. It was banned from OU last generation, and it was banned from OU this generation in many palces for good reason.
Don't ban Sand Veil Gliscor: The benefits of Poison Heal Gliscor outweigh the benefits of Sand Veil Gliscor. Would you rather have 12.5% recovery each turn, or have a chance at a move missing you? The majority of people lean toward the former choice, so I don't see any reason to ban Sand Veil Gliscor.
Don't ban the abilities Sand Veil and Snow Cloak: I've already stated why I think they shouldn't be banned, just look at the first few paragraphs.