I don't agree with "ban all auto-weather abilities." Weather isn't ruining the metagame, and you don't need to run weather in order to succeed. Weatherless teams have been proven to work. Banning weather isn't guaranteed to increase diversity just because OU isn't really a place known for diversity in the first place.
I don't think Excadrill should be banned either. It has a fair amount of counters/checks, and like I've said before, any of its attacks that are not named Earthquake really aren't that strong. Yes it gives certain playstyles like hyper offense a hard time, but it doesn't make them completely unplayable, just like Reuniclus doesn't make stall completely unplayable. (Both hyper offense and stall teams have been proven to work as well in this metagame).
I do however, think Latios should be banned, because it's the main reason why specially defensive sets are all the rage these days, and that it can cripple all of its counters with Trick.
And Deoxys-S too, because it's either practically a guaranteed layer of SR/Screens or more, or the fastest sweeper in the game. Predicting the wrong one will also end up leaving you at a huge disadvantage.
Thundurus is something I'm not too sure about.
Baton Pass and Shell Smash I'm also not to sure about. I've never had much trouble with them, but that was only because I ran Roar on Tyranitar that was solely for countering them (and because I had nothing better to put on it). Because of this, I'm not sure it should be banned, but there are some pretty convincing arguments on how it's broken.
Don't re-test Garchomp. It's not broken because of Sand Veil alone, but also because nothing has changed about it since it was deemed broken in Gen 4. Its best "counters" are still Skarmory and Bronzong, and despite 102 Speed not being "fast" anymore, none of the new pokemon can OHKO it or check it well anyways.
Don't re-test Blaziken. It's surprising how so many people think Excadrill is broken and yet think Blaziken isn't. It has fewer counters, much fewer checks, and basically requires you to use a strategy that involves a combination of two or more pokemon to beat it.
Don't re-test Manaphy. Even if Drizzle were to get banned, what's to stop people from just using Rain Dance? The fact that Tail Glow got better is the icing. It was broken in last gen even without Drizzle (and even Kingdra under Rain Dance wasn't considered broken last gen).
This is what I think.
edit:
Dragonite is not broken. Offensive ones are basically outclassed by Salamence (who is also not broken) and Bulky ones are surprisingly not that strong even with 1 or 2 DDs.
Volcarona I can understand arguments of why it's broken but depending on what set it runs it will get walled by something.