Just said all of this yesterday to my LS. This MP issue is not going to affect mages at all. Mage classes will always get parties and more often now. People will shoot for high MP load parties for guaranteed success now. Will be 6 mage classes (4 conj 2 Thaum) and 2 Glads. Even archers will get left at home eventually if the tanks have real trouble with high end spike damage. Two conjs will heal while the other two spam Conj DoTs and hit with elemental spells as their buffs pop up, minimizing hate control issues. The two thaums will spam Dia, Bio, Poison, Slow, Paralyze etc. or one will assist the tanks with Initiation and the Siphon attribute spells to help the tanks and throw in a Sac 3 here and there to let the Conj healers get some rest or mana burn in emergencies. They can also raise people if someone drops without a conj healer missing a beat.

Either way it looks pretty grim for DD classes unless they really restrain themselves. Big numbers will be bad news for DD classes.