We've never had on size fits all learning--the standards have varied by state and the difficulty of state tests have varied substantially for years. So I am mystified by this article's title--perhaps an editor for the site wrote it. I would be immensely disappointed to think that Dennis is the title's author.
CCSS, in fact, reduces the past disparities among individual state standards (the Cy Young states like MA vs. the minor leagues like TX) by suggesting higher standards in clear terms. This could lead to greater one-size-fits-all learning. However, without uniform tests, the batting averages of different states will still be comparing apples to oranges since the tests serve to operationalize the standards. We have two testing consortia which began with decent support from most of the states, but these consortia are starting to break apart because of the associated costs of the testing, and because of growing opposition to testing and/or to 'national standards' which some see as a violation of constitutional obligations of states to control education.
And lately we have begun to see two other testing companies suggest they will develop, or already have, tests that can be used to measure CCSS achievement in lieu of the two national testing consortia. Both ACT and College Board (SAT) are developing alternates to the testing consortia which are being considered by several states for use instead of the consortia tests. If this actually happens, we'll be slipping back toward the chaos the CCSS were intended to replace. With four testing companies, we'll have states reporting result on 4 tests instead of two, doubling the challenges of determining the batting averages of students across the nation. And if we get four tests, it won't be long before Pearson and McGraw Hill, or others, write their own tests and underprice the others, thus destroying the idea of a means to determine the quality of school across the nation.
Some will argue the tests can be equated statistically, which is likely correct, but which would make rational discussions of comparisons a black box process which parents and politicians will be quick to interpret for their own politicized motives. Statisticians will meet their tenure publication requirements debating the statistical adjustments for the testing comparisons, and their work will be ignored as politicians focus on firing teachers to improve schools.