Now we seem to have a justification from Mary Flynn of Creative Publications -- that's right folks, the people that brought us MathLand.
In the February 1997 issue of American Teacher, Flynn offers support of the reform, beginning with:
"The total amount of information that humanity can claim to know currently doubles every five years; by the year 2020, when today's elementary school children are in their 20s and 30s, it will double every 17 days."
The implication seems to be that the things that are available to be known about math are changing so fast that there isn't any reason to bother learning them in the first place.