Truth be told, a lot of this anger and frustration will be obsolete in a few weeks once 1.7 becomes the new norm, an d 1.6 with its awkward sprint becomes unsupported. Once everyone jumps on the 1.7.2 bandwagon, including Optifine and the rest, the sprint functions everyone wants will be standard. No more needing a modded client to get a sprint that we want, and there won't be the unintended consequences and unfair advantages that mark BSM as a means to cheat.
But I think in all the negativity surrounding the arguments rationalizing BSM use and the frustrations of 1.6 VS 1.7, we lose sight of what the new BSM-removal feature gives us: a more level playing field for MCSG that allows games to be more competitive and fair for the players. Once everyone's onboard with 1.7 and we don't have to deal with 1.6, we'll have a large and popular mod that conferred an advantage against vanilla 1.7; yet we get to keep the easy-sprinting of 1.7 to boot.
We're getting rid of a major means of cheating that grants players some unfair abilities over vanilla players (i.e. the majority of the playerbase). And we're doing so in a way that is completely automated, very forgiving (kicks instead of bans), and guarantees removal with little/no chance of false positives. This is a system we've only dreamed about before, yet we made it reality.
Players are happy because they don't have to worry about unfair games or players with hacks.
The staff is happy because a large section of their anti-hacks workload is automated with 100% success, so they can focus on other tasks (or other hacks).
The community should be happy because we provided both of the above, in addition to successfully reinforcing our anti-BSM stance which we've stood by since the very beginning.
Whether you support BSM or support the new system, I think that this update will be an overwhelming success because it accomplishes ideas that we've always striven for.
We just need to get through the awkward transition between 1.6 to 1.7 to finally get over the negativity and feel the effects.