“Among low-income students, the effect was even more dramatic: for every 1,000 low-income students who had taken the test before 2007 and scored well, another 480 college-ready, low-income students were uncovered by the universal test”.https://twitter.com/andrewraconway/status/962069008798265345 …
How much of this will go away though? Lower mean groups' members who pass some threshold will regress more. The effect is stronger the lower the test reliability and the larger the group gaps.