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The most effective way of disrupting a BP chain is instant brute force. Always has been, always will be. Really skilled BP players can overcome it, but it's difficult. It's really hard to set up when you're getting punched in the face all the time, and the vast majority of BP mons are crazy frail before the boosts.
Of course, since stall teams get rekt by BP it had to get nerfed. The sad thing is, the whole thing had the simplest solution: ban scolipede or ban espeon.
Without Scolipede, they have to rely on nice things like ninjask, or even Combusken to use speed boost, which makes them crumble even harder under offensive pressure. Without Espeon, they're hella vulnerable to phazing, and one good link break makes them cannon fodder.
This ban is one of the many reasons 6th gen Smogon was a gigantic train wreck. Glad to see it go, but I don't have hopes for 7th gen