(ew my first post, kill me)
I was actually discussing the whole BP thing with my friends at work the other day, and most of the conversation was "Just run the damned counter to BP" vs "Dude, it's not something you easily prepare for, or even counter". Granted, I've only run into it a FEW times in my OU laddering career, but more often than not, my attempts at stopping the BPers were short lived. But honestly, I don't think this is something easily approachable simply due to the fact that the issues lie in only a few of the BPers in the metagame are even making this a topic. BP before was meh, but you throw in these abilities and suddenly you have a chaotic carnival.
One of the things I actually thought about before was "What if you just ban Magic Bounce + BP on Espy", but then you'll hear the neverending "BUT MUH ESPEON CAN'T BP WITHOUT IT LET ALONE BE USEFUL" (in which case use someone else because Magic Bounce is the only reason he's there what are you doing), and I'm almost certain no one wants to hear that every day for the next 6 months. But it seems that the problem only lies in what, Espeon mostly? (Forgive me, I didn't read all 72 pages of the thread) So it's a mixed bag to me.
Personally, I'm in the middle. Good BP teams aren't flooding everywhere, but since SwagPlay is gone, nothing is stopping it from becoming the next hot shit on a plate. Now that Haze is the only "real" option, I think that by itself slowly seeps it into the centralization bench. And just how many Hazers are you gonna run? They're bound to die eventually, especially if two of the relevant ones are frail as wet paper. (Greninja and Gengar, correct me if I'm wrong though, and I know that there are more bulky ones out there but they aren't named Quagsire and LOL Evolite Golbat?)
I would have to agree with a complex ban here, because outright saying "NO" to Espeon isn't fair at all (Soundproof Mr. Mime can eat one though, I don't give a damn), but I can't sit and be okay with the Boston Baton Passers assisting their whole team to the point where I'm just a living damage calc for half of the squad.