In a mode that is barely competitive I don't see any problem with the above. I asked out of curiosity, not because my rank is important to me. For all it's worth, I would still enjoy BG, should there be no ranking system at all. Who cares if afk players are lower or higher? There is a huge difference between ladder and BG and that is because on ladder higher placings grant you rewards.
Right now BG is a wierd hybrid between a competitive mode and a totally casual mode and Blizzard themselves send mixed messages regarding this.
Even if you ignore mmr, competitiveness or rewards, they still had to do something about the exploit because new players were getting matched with people who already know most of the strats and builds.
Unlike in other modes, where you get something for winning AND your w/l depends on your cards/deck, in BG being matched with strong players is actually a good learning experience. Of course it's not nice to be crushed, but sooner or later you will get a grip. Sooner if you will be playing against better opponents. I myself have learnt some interesting strats by simply being crushed by them.