Update: There are a bunch of topics in this thread, but this recent comment by ArchStation seems particularly likely to generate sparks. Let me highlight the key bit:
We know of other families leaving APP because they are dissatisfied with the math curriculum and perceived instability of APP and SPS ... [I] think that there might be room for another gifted private or co-op school in Seattle.
Who would really be interested in leaving the APP program for an alternative gifted school? Is there enough of a critical mass to make this a viable option? What model would appeal to you: a small homeschool co-op, a new private school for gifted kids, something in between, or some other model I haven't mentioned?