This is going to happen either way. I said this in a post way back, but if we ban Swift Swim, Chlorophyll, and Sand Throw, nobody will use Rain or Sun anymore because basically they are wasting a teamslot for a crappy pokemon. If only Golem had SandStream in Gen IV, do you think you would be seeing any SS at all in Standard OU? Of course not.
Wait, leave me analize the "crappy pokemons" of 5th gen:
-Tyranitar: A strong and bulky (even bulkier with x1.5 bonus to its sp. def in SS) pokemon that was very popular even before SandThrow (and going farther, even before Sandstream), able to use Pursuit and make much damage with its high attack stat and moves like Crunch, Stone Edge, Superpower and EQ, a good lead able to use SR, a good Scarfer and a obvius threat with good coverage moves.
-Hippowdon: One of the best physical walls of the metagame, it can be very useful for stall teams, it can use SR, Roar, Yawn and Slack Off, and it can also boost its both defenses with Stockpile or use a STAB EQ for some damage.
-Politoed: A few faster than Tyranitar, it can use an double STAB Boil Over (or, if you prefer more power in exchange of the probability to burn your oponnent you can use Surf or Hidropump) while it is in the rain and anyway a water move with x2.25 bonus of damage isn´t nothing to laugh at, it can use Hypnosis or Encore making it sometimes a very annoying pokemon, it can also sometimes resist strong physical attacks and make a KO in return, it get good coverage with Boil Over, Ice Beam and Filler (HP electric/grass or Focus Blast), and the Water type have good resistances.
-Ninetales: A good speed and sp. att., x2.25 of bonus for its offensive fire moves while it is in the sun, Will-o-wisp, Hypnosis, Nasty Plot, Psycho Shock, Confuse Ray, Calm Mind, Flamethrower/Fire Blast, Solar Beam and it can also use a Balloon for solving its weakness to Ground (the only bad thing is it weakness to SR, it lack of resistances and it frailness, a synergical teammate can solve it).
-Abomasnow: An elemental combination that can be useful for resisting Water and Ground attacks, two 120 base stab moves, a priority move, and two decent offensive stats, it can do a good work with Leech Seeds and Sub-punchs and it have some other moves like EQ, Focus Blast and Gigadrain, it is too weak to SR and have some important other weaknesses but nothing that can´t be fixed with a good teammate with RapidSpin.
Now, seriusly speaking, anyway, baning Swift Swim, Chlorophile and Sandthrow, is obviously more reasonable than baning auto-weather abilities, in every way.