IIUC, one of the best predictors of a person's earning potential (which we can of course use as a proxy metric for their worth to the economy) is the wealth of their parents. So, why not quit funding public schools? It's two birds with one stone: only those who choose to have children will be responsible for paying for the services they receive (viz. tuition for an education), and we eliminate a subsidy for undesirables who (statistically speaking) are much more likely to become welfare leeches.
That's what I call a win-win.
edit: rather horrifyingly, this sarcasm is going over people's heads (my fault, of course). See https://news.ycombinator.com/item?id=29388282