I've read a few comments lately saying, in effect, "The Common Core, et al, are fine ideas, but some states, etc., just tried to go too quickly."
That's a crock because an insanely fast pace of implementation was a central feature -- and prerequisite if -- the entire "Race to the Top" agenda. It is a "race," you see! If you could get in a time machine and show that the current plan couldn't be completed by 2015, you would have gotten an entirely different plan that might be implementable in a short enough timeframe. They wouldn't have said, "Oh, ok, as long as it takes to do the right thing is fine because we have deep faith in the power of our ideas."
Probably you would get a decision to not re-write the Common Core from scratch for no reason, but to use the superior version they already had in hand. For some reason everyone still pretends that wasn't a perfectly reasonable approach.