Our DS is in 7th grade in a regular public school and we have every expectation that he will graduate with his age peers. He is subject accelerated in math and is in honors classes. He fills his need for challenge through lots of clubs, a few sports,music, and an interests in just about everything.
I think it is his personality and a school that "gets" him that makes this possible. We spent the first several years expecting that a problem would show up that would require drastic changes, but this has never happened for us. But just because it has worked for us shouldn't be taken to mean that it will work for you or that there is something wrong with a HG child for whom it is not a good fit. KWIM?
