I'm of the school which has it that a healthy electorate, as far as it goes, is an informed electorate. The US citizenry as a group is lamentably uninformed. In an absolute sense, and more risibly so in a relative sense considering its self-induced hallucination of Greatness. For a Nation which projects such awesome power, its people are woefully insular and ignorant, exuding something of the arrogance of the self-righteous.
The very fact of the internal, almost civil war-like battle against religious and fundamentalist nuttery, which has fomented schisms regarding such societal issues as abortion, guns, recreational drugs and sexual identity, points to a still widespread immaturity in the populace. Which is only fed by blinkered isolationism on levels both global and local.
No, it's not all bad, to be sure. Progress is being made in some respects. But sometimes haltingly, and sometimes after enduring worrisome reversals. And these days, there would seem to be a larger number of reversals in progress and in the offing.
Educate them young 'uns to not stop learning just because no more tests need be taken. Teach critical thinking, which is probably more important than raw knowledge. Regard the wider world beyond the end of your nose.
My kneejerk response to establishing a body of 'qualified' voters is to find it a frightening prospect. It's too easily perverted into an elitist control. Nope, democracy can fluorish only via the participation of all. In spite of the ills that can attend and entail.
Just as it must be for, say, a free Press. We must accommodate Fox and Breitbart along with CNN and PBS, and The Washington Post and New York Times. What happens if we or the Party in power haughtily censure any outlets deemed objectionable? Where does that stop?
It's not Democracy if Doofus Donderhead from Hicksville does not have the same voice as Richie Rich of Silverspoons. Ideally we'd not let Doofus wallow in ignorance. But if we can't effect such change, he is still a citizen...