Back in actual cataclysm you would earn 192 per win until you caught up to your MMR where it slowed down.
Now in classic you still get 192 when you have 0 rating but after about 1500 it just falls off and you only get 24 points max.
I have 2500mmr but 2000cr. I play constantly against the rank 1 team and lose 0 points but only gain 24. It is taking forever to catch up and is miserable compared to what it once was. If they returned it to the way it originally was id be able to play all my characters and have fun. Instead it takes weeks of games to get to a 2200 weapon.
There is 0 downside to returning it to original values. More peopel will play, more people will feel more accomplished.