Haven't played since Late Round 3 (waited for metagame to settle down: clearly hasn't): I can understand why Speed Boost Blaziken got the boot but why did Blaze Blaziken get blanket banned as well?
I think that the power creep kind of hides this fact: When a Pokemon itself (Movepool and base stats) is fantastic and it receives a fantastic ability, you get problems like this. Sand Rush Excadrill is another good example: the ability is good and the pokemon is good, but when you put the pieces together the synergy is phenomenal.
But it seems like rather than trying to stop the synergy ("complex bans"), the Pokemon itself is refused admission. As more and more Pokemon are introduced, you're going to need a more complex system to deal with them. This has been handled wonderfully in the tiering system:
4th Gen: Uber > OU > BL > UU > NU
5th Gen: Uber > OU > BL > UU > RUB > RU > NU
Two new tiers have been made (or rather in the process of) to deal with 152 new pokemon, maybe 50~ items, and a bunch of new abilities, or abilities in places where they didn't used to be (DW). The tiering system is undeniably complex right now, so why isn't the method of regulating the meta do the same with it's bans? I don't know, Blaziken is a good wallbreaker with Blaze, but it's not amazing. Speed Boost is awesome but not game breaking: Yanmega, Ninjask, Sharpedo. Only when you have BOTH do you get something troublesome.
If my concept hasn't been made clear: here's a Yugioh metaphor. "Exodia, the forbidden One" is a monster than when in the hand with the 4 other pieces of Exodia, you automatically win right then and there. Because of this, a deck is limited to only have 1 copy of the each of the 5 pieces in their deck. But, if you take out "Exodia, the forbidden One", and use only the four limbs, there's nothing remarkable about them. You could easily just run the maximum amount of copies in a deck (3 is the max) of the 4 other pieces with no harm to your opponent: they can't really do much to your opponent. They do nothing other than act as simple effect-less monsters, and having a rather small attack and defense. The only thing they could do is bluff to your opponent . Thus, it's the synergy they have with "Exodia, the Forbidden One" that they get their power from (Konami neutered their synergy by limiting each piece).
I don't understand why entire Pokemon need to be entirely banned because their primary competitive abilities complement them so well that everyone thinks their OP? Ban Speed Boost Blaziken and Sand Veil Garchomp if the meta can't handle them but (my bottom line) don't make foolish blanket bans on Pokemon. You can easily just prevent users from using the ability in the ladder rules.
My partially educated rant is over.
Edit: Sorry if I misunderstood something (I probably did given how much I said >.<)