My personal opinion is Blizzards development team logged on the PTR as a mage and within 2 minutes of dueling people (especially healers) and realized "wow gold, we need to do something about mages quickly; otherwise we are going to have another shadow priest next patch." The outcome: the introduction of mage MS about
wow gold.Not to digress too much but I will say that my overall feeling with all of the new changes on the PTR as a paladin was that it was significantly easier for me to stay alive against every class with exception to warriors (more on this later), who are still ridiculous to heal through.