You sound like you're simply being defensive because you're a teacher. That might not be an entirely objective position because the suggestion might seem to imply you're not as needed, and that is not really the suggestion. I'm also not suggesting that day care facilities are exactly the same as middle schools or high schools. I'm making a loose analogy because part of the reason behind the schools are that parents cannot teach them this information due to the fact that need to work, and that we have specialized educators for specific topics so the if the parent can't read then the child can still learn. Or they simply cannot afford private education and broad based day care is cheaper. Do teacher's get paid a lot? That tells you right there.
The suggestion, which I've already elaborated on, was that the preparation should not be as broad and general. That the goal of teachers should be to teach children how to learn about what interests them most, and whatever topics they may need on their own through self-study. How to teach yourself, where to get the information and how to go about it. To the extent that they need further help they should be taught how they can seek out their own specialists in fields the feel they need more understanding. They should also be taught to question the information being given to them and to measure it's quality for themselves instead of just accepting it from teachers.
This is different than children being told that they need this broad array of subjects, facts and testing before they're allowed to walk through the door to higher-education.
A video game designer is not a naive specialization for a young child interested in computers. He/she can go into game design, character design, animation, modeling, programming, physics, simulations, etc. at a very young age with no need to learn other subjects until an older age. There are instances of very young kids making iPhone games, websites, etc.
I can assure you that when challenged with a lack of math in the quest to finish a video game, that student is going to learn the math concepts they need on their own
using Wikipedia or Youtube, Khan in order to achieve their objective. They're not going to want to just learn all these concepts when they're not needed and have no immediate application.
I think children are probably better at teaching themselves that we think. It would be interesting to see if there was a school where children had free reign to go to any teacher they wanted and sit in on any classes they wanted and work on any projects they wanted. Or to simply make use of recorded content they could listen to at their own pace, similar to Khan. Children would eventually get bored and take up some field of study that interests them. They would eventually run into concepts that challenged them and possibly find that they enjoy learning by feeling empowered.