Basically what needs to happen for summoner is that, they need to change shadow flare from a 30 sec DoT Slow to a 30 sec Dot Mana Drain with the amount of mana restored will be a percentage of the damage dealt per enemy caught in the circle. I figure if they did that then the summoner will be able to last longer in fights as they will be able to regain mana without sacraficing dps. Now what concerns me is that with energy drain, its almost as if that is the skill that is holding them back in terms of dps, while it does give back some mana it doesn't really give back enough. If a summoner dies in any raid, they basically have to spend the next 3 minutes doing a ruin and energy drain rotation, till they can get back to full mana. Certain things could be tweaked a little bit to make them more viable, but until the expansion we shouldn't speculate on what they may do, for all we know they may give us a summon that regains mana for us.