Riot I think it's time to take a look at the way you handle the Support role.
The problem isn't with new Auto-Fill Dynamic Queue, or regular Dynamic queue before that, Team Builder before that, or blind pick before that.
The problem is that no one wants to play Support. You have people never queuing up for it, causing increased queue times and players playing things they don't want to because now they're getting auto-filled. When you implement this new "Exclusion" role, you're going to see the exact same queue timers you saw before in Team Builder and Dynamic Queue before you put in Auto-Fill.
Don't you think that when everyone is telling you they don't want to support, it's time to take a look at the way Supporting works?