Pure support role wouldn't really work in this game unless theres massive changes to battle system and party sizes. A support class can't be balanced in the current game it would be either completely broken or worthless. Since it would have to replace a dps slot it would have to buff the dmg of other dps in full parties by33% but in light parties have to buff the other dps by 100% to make up the loss of losing a dps slot. Not to mention it would add new issues to the game. Queues will be longer with roles spread out, a dps dying is now a bigger deal with loss of dmg and if support buffs dps enough to warrent its replacing a dps the its buffing of 5dps 1 heal 1support 1tank parties will be insane.