Yes. Many high performing schools that we visited are offering a reduced selection of AP courses or have dropped them altogether. Examples of these schools include Phillips Academy, University of Chicago Laboratory School, San Francisco University School, Scarsdale, Sidwell Friends, Nueva School, and Crossroads School for Arts and Sciences, to name a few.
Of this list, Scarsdale is most similar to SAS in terms of demographics. Although Scarsdale is a public school, it is similar in size and serves a similar demographic of high-achieving students, Scarsdale had similar concerns when they transitioned from AP to AT. They now have ten years' worth of data that demonstrates that their admission rates to selective schools have held steady or increased in the time since they introduced the advanced topics curriculum.
In addition, reference the ongoing work of the Independent Curriculum Group (ICG). The ICG is a consortium of public and independent secondary schools committed to the development of “high quality, mission-based, teacher-created curriculum and assessments.”