Oddly enough, some of the HS math teachers in our district are against compacting and acceleration in MS. One HS math teacher made the comment, "We'll run out of math for them." (face palm) Some HS administration shun the idea of Algebra in 6th-7th grade as well knowing that by the time the student is a Jr. / Sr. in HS the district will be paying for that student to go to a local college to take Calc. II and or Calc III. This is when as a parent you've got to be the squeaky wheel and insist.
Oh, the secondary math teachers in our district have also been leading the charge against acceleration. Our elementary school high ability program used to "feed" about 30% of our kids into 6th grade Algebra...30% of our kids into 6th grade Pre-Algebra...and 30% of our kids into a "regular" 6th grade math class that was designed to lead into 7th grade Pre-Algebra (percentages are rounded...blah blah blah...I know that only equals 90%). Our high school math teachers started complaining that kids weren't developmentally ready for Algebra as 6th graders and that they were "topping out" of math classes too soon since they were still required by the state to have four math classes in high school. We (as the elementary GT teachers) were told by the high school math teachers that the only kids who would need the highly-advanced math classes in high school available to kids who had started with Algebra in 6th grade were kids who were going into advanced math-related careers, and 5th grade was way too early for kids and parents to be making the decision to travel down that path. So, back to a math curriculum that is an inch deep and a mile wide for most of those kids in 4th and 5th grade. My district loves rigor, but only rigor that is convenient for administrators and doesn't require additional expenditures and class sizes of fewer than 20 students.
