Indigo, I'm specifically concerned with this:

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Lucas warns that any such effort will be gamed by more well-to-do parents, angling to get their children in, then fighting to ensure the gifted group gets better teachers, newer technology, and other advantages. Great care would be required, he says, so as not to “end up with another system for those at the top to reinforce that they belong there.”

and this:

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Those who were groomed to be followers, he notes, consistently wound up with worse teachers, scarcer supplies, and a weaker curriculum than their more advanced peers.

Unintended consequences, of course. But very real phenoms in my experience--and those they hurt are those who can least afford it. Of course, this doesn't mean we should throw the gifted under the bus. But it's very complicated. My DD's school contains a GT magnet housed in a Title 1 school and yes, there are issues.