While I found no mention of a ranked matchmaking system actually being implemented in the 1.3 notes or it's article, it appears there may even be ground work alread designed for what has been suggested. Essentially a split solo and group queue, yet with the ability (and flexibility) to cross fill after a short amount of time.
I could accept (I still consider it a hack, instead of "proper" matchmaking) this with the notification, so I know what matches not to enter. If I choose to PUG I will not want to meet a premade.
In the end this is a futile discussion. People have their own POV and will act accordingly. Most likely less PUGS will PVP if nothing is being done to alter the situation.