We haven't dropped this at all and we've actually still been working on implementing it. Currently it's planned for sometime in the next patch or two and the way it will work is pretty straightforward.
If you catch a suspension from the game or get to the point where you're getting more severe chat restrictions, you'll receive a ranked queue ban until you re-earn the ability to queue into ranked again. So hypothetically if you leave too many games to the point where you finally catch a 24 hour queue suspension, when that suspension is up you'll be required to play 5 normal games before you can step foot into ranked again. For right now we're keeping it at 5 games regardless of severity or history, but we could adjust that in the future after we've observed how it works on live. The important thing to mention is that if you're hitting this point you've possibly caught a few infractions, and have already encountered a few queue delays or honor impacts before you hit this point. (Or did something so severe you got fast-tracked to it) TL;DR: If someone is catching this, they're earning it.
We're eager to see how this works and will likely follow up on it's impact.