I really find that a waste!
Their talents is unused, and they can end up finding the education a plaque, only because they're ahead academically. What they need is to get their talent stimulated. And I think the teachers should give them the chance to have it. Of course without forgetting to help the rest of the class. It is possible to do both. It's just something the teachers and everyone else have to realize. The students didn't choose to be bright, nor did the students who find it very difficult, par example dyslexics; they didn't choose to be that neither, but then the education has to adjust to it. It's the same with the very bright students, just the other way.