Agreed. Just shift them a year ahead, or in an AP track, or bury them in extracurriculars. It really doesn't seem that hard to me, to accommodate a precocious kid, especially in large schools or large public school districts. (shoot me down if I don't know what I'm talking about). The studious ones will be ok, has it ever been different?
Year-ahead works in high school where you're in various different classes anyway, but it can be harmful to the students in other ways, especially earlier.
Just because you're smart enough to perform at a 10th grade level doesn't mean you're mature enough or will fit in.