The problem with this whole idea is that “60-70-IQ” players NEVER play against pros. At all. And there would be absolutely nothing for Blizzard to gain by matching them against each other. If they want bad players to keep playing then by far the best strategy on Blizzard’s part to keep them playing is to keep their winrates above 30% — psychologically speaking 30% is known to be the minimum where bad players don’t quit — and by far the easiest way to do that is to simply match bad players against equally bad players, normalizing for 50% winrate.
This idea is so profoundly narcissistic that it becomes stupid. No, your game of Hearthstone is not a big deal. Blizzard wouldn’t script it even if they had the time to, and there is no massive stadium audience for the game that you’re playing. Your game of Hearthstone is not a multi million dollar event. Rigging wrestling makes sense. Rigging Hearthstone does not.