Perhaps some people haven't realized this, but boost had been a testing ground for new language features for a long time. That's basically the point of TFA.
Boost runs a lot quicker than a standards body, but the proposal isn't quite as good. I personally like boost's "quicker but worse" methodology, but I can see the value that the official c++ standards committee provides. E.g. the atomics interfaces were previewed by boost, but to be done well really did require the more painful standards process.
In any case, I see the status quo as mostly healthy. It might be better if boost was to be officially encouraged, but most serious users of c++ understands that boost is useful without official endorsement.