Can we end disadvantage?

No we can't, don't be ridiculous.

To end disadvantage you'd have to create a system that ensured every single child's physical and emotional wellbeing.
In order to end disadvantage, you'd have to end childhood dysfunction and lives that are tainted because of it.
To end childhood dysfunction you'd have to ensure that kids aren't negatively or detrimentally impacted by divorce, remarriage or one parent moving away, as well as parents that don't care for their kids or don't have their kids best interests.
You'd also have to alleviate all chronic health conditions, so that no child or their parents suffered such a thing - to be disadvantaged by.
You'd also have to pay for plastic surgery to make the ugly kids not so ugly, so they weren't disadvantaged by their ugliness.
It's a known fact that better looking people get things given to them a lot more often and easily.

So before you even begin to entertain this crazy fairytale in any kind of realistic sense you'll have to figure out how you can fix the few issues I've outlined above, to have any kind of a chance of actually achieving 'ending disadvantage'.

Here's another thing you could try doing instead:

- Get Real.