The same with many government school districts. You're actually making the case for homeschooling, because the parents would not be under the same meat grinder type of pressure government schools are under to push the child through the system, no matter how much he/she learns or doesn't learn. At any rate, you're presenting an extreme case as if it informs on the mainstream. Should we shut down homeschooling because a miniscule percentage of students need more than their parents alone can give them, or should we shut down government schools because some districts can't provide for the needs of those with learning disabilities? Heck, we took our son OUT of government school when they wanted to short bus him because his anxiety and Assbergers got too intense for him to focus in the classroom. We put him on an online curriculum at home and he thrived. Today, they can handle Assbergers better in class, but there are many issues kids have that they can't.
Nonsense, I've already mentioned online curricula that can teach courses at whatever advanced levels they need to (you have heard of online college courses, haven't you?), and how many government school districts have access to highly advanced computer labs? Not that many. Again, our son learned Spanish by online interaction with teachers that could hear his pronunciations of words and who could help him say them right, so foreign languages are not a problem.
Again, you're presenting things you think are weaknesses of homeschooling without realizing that many apply to government schools as well. Do I take them as evidence that government schools need to be shut down or opposed at every turn?
I'll say it again, homeschooling is an excellent option for parents who want their kids to have the best educational opportunities.