MrE I understand where you're coming from, but your argument is petty, at least the paragraph being directed to me. How do you know that sand won't lead to a balanced metagame through usage stats? I understand this is your way of determining things. My way of determining if its balanced might not be the best either, but at least its based on logical reasoning of abilities and how they can be abused, not some continuously-changing numbers. The fact is that sand isn't broken like Drizzle and Drought because it only has a few pokemon that abuse it to the extent of broken, i.e. Excadrill and Garchomp (maybe Landorus, we don't know for sure yet). And dude, Tyranitar is at the top in usage because it's the so-called 'enabler' that has to counter the other 'enablers', we are in a weather war metagame and not everyone is going to uniformly use Politoed. Also, your point of BW OU becoming DPP OU+Excadrill is sad and not thoroughly thought out. Based on this statement, I expect you to believe that everyone and their mother is going to use sand in BW OU after rain is out. Did everyone and their mother use sand in DPP OU? Tell me, if by chance sand and hail remain the only permanent weathers in BW OU, you really think everyone is going to use sand or hail? No, because the abusers that would be left, with Excadrill and Garchomp banned, would not outweigh the variety of existent sweepers that can wreck without the need of weather. Hypothetically, with Excadrill and Garchomp banned, Landorus (doubt other Sand Force users would outweigh the other sweepers available) and 5 other Rock-Types (plus old Rock-Types) that have been added this generation would be left to abuse sand. This brings me back to why sand could potentially lead to a more balanced metagame. With only Landorus and 5 other Rock-Types added this generation, do you expect sand to take over? Based on ADV OU and DPP OU, I can say that the inclusion of sand in the metagame leads to a decently balanced metagame (NOT COMPLETE BALANCE, just in case anyone feels like refuting that), and with not much change in sand abusers (with Excadrill and Garchomp hypothetically banned) we end up with a metagame not dominated by sand. Also, please don't say everyone is going to start using sand because of the fuking ~6% that chips at your health. Of course, this is my opinion, my subjective analysis trying to be objective about BW OU's stand (dgaf if it's an oxymoron).
Nonetheless, the rest of your points make sense. Weather shouldn't be banned if its gonna make another one stronger, and as a result a weatherless metagame is another path BW OU can take in the long run. I personally think that the banning of Drizzle won't make sand, the weather you describe in this case, overpowered (with Excadrill and Garchomp banned), and will probably result in Drought becoming hell for everyone (I suggest this gets banned soon). In retrospection, just because the path I chose to predict doesn't match the one you predict doesn't make your 'preference' better, it just makes it another one in the bunch.
The three paths I think BW OU can take are: the one I describe with rain and sun out of the picture, the one MrE describes being weatherless, and the one jibs advocates which is NO SUSPECTS (which I think I understand now because the current metagame is ironically balanced in middle of the weather wars with nothing truly broken). The path Smogon takes will be dependent on suspect tests.
As a final note, I want to say that I completely agree, the banning of Brightpowder/Lax Incense and the intent in banning Sand Veil/Snow Cloak is dumb.
P.S. I'm in favor of banning Politoed, Excadrill, and Garchomp if that helps you understand my perspective.
Quoted for excellence from the policy review forum. This is exactly what i've been saying the last 3 test..