Originally Posted by
enchiridion
I dont think it would work out, simply because it would make boss tuning a nightmare, while a dungeon crawler like D3 can have several difficulty levels, that would be kind of an unruley task in wow, especially considering there are set group events (raids, dungeons, etc) so if you have a spread from 1000-4000 paragon levels with 20 people, what difficulty do you make it.
Essentially wow is too structured for something that affects damage output, now maybe somehting like movement speed or profession efficiency might work out.