With the weather argument, we basically have to answer one question: Is the surge of weather teams simply a fad, or is this truly the metagame we will be playing in?
The weather metagame is a fad: This could very well be an example of extreme overhyping a certain playstyle. Rain teams can be beaten without too much effort, and there is no reason to ban the weather inducers right now. There's nothign too broken about them, and we simply have to withstand the overcentralizing for a bit longer. There is no reason to ban any of them currently, as soon enough rain and sand won't be so prevalent.
Weather will be a part of our metagame: As I said before, there is nothing too broken about these teams, and there are simple ways to counter each. The only problem is the overcentralizing of the metagame. If every team needs a designated Sand counter, a designated Rain counter, and a designated Sun counter, then weather has completely taken the metagame by storm (hahahahahaha). If every team is either weather based or based on countering weather teams, then weather has clearly affected our metagame in a negative way. This is clearly overcentralizing, and these users must be banned not for being broken but for overcentralizing.
So essentially, if the metagame is still in the process of evolving and drastically changing and taking shape, the weather inducers can stay. But if the metagame has stabilized and will remain like this unless there are significant bans, then the weather inducers need to go.
After I've said that, I think we need to ban abilities instead of pokemon. Politoed itself is not why people use it. It's because of Drizzle. There's no reason to ban mediocre pokemon like Politoed and Ninetales just because of their abilities. We need to ban the abilities, not the pokemon. People are making the argument to ban Octillery. Octillery itself is a Trick Room sweeper and a good baton pass recipient. Inconsistent is why people think Octillery is broken. If Pachirsu had Inconsistent, people would argue that it is broken. There is no reason to ban Octillery, there are only reasons to ban Inconsistent. Many argue that this results in a slippery slope of ability banning, but I say only if we make it so. If we simply are careful what abilities we ban, it won't erupt into a massive banning spree. We simply only need to ban those that are clearly and undeniably broken, such as Inconsistent.