While I agree with this sentiment, my problem is with the one-size-fits-all approach taken in San Fran. Lumping gifted children in a class with everybody else does them a huge disservice...
My personal experience in 7th grade (pre-algebra) was horrible. My school decided to experiment by placing gifted students in math with the rest of the kids, with the idea being that we'd magically bring up the average performance. Instead what happened was the nerds sat in the back bored out of our minds and lost a year of math education (and this was with an extra teaching aide in the class - the two teachers simply couldn't keep the non-gifted kids on track AND provide us any extra attention). This left us all behind when we entered Algebra in 8th grade.
I hate to be "that parent" - but gifted kids have different needs than normal students and deserve the opportunity to excel without waiting around for everybody else to figure out 2+2.
Edit - I don't care if the advanced math offering in 8th grade is called Algebra or something else, as long as there is an advanced offering. The linked article made it sound like there was not such a class.