As a magplar, we are near the bottom of the list for sustain, especially when in groups where Healer's don't have the proper sustain buffing sets. If we are losing the magicka regen passive from the vamp skill line, we need that sustain to come from somewhere else. As it stands now, if we lose out on that sustain boost, it will force us to have to use regen food (which is a noticeable loss on DPS, and I already have to do that for groups that aren't properly geared) and/or switch over to Breton (again making us lose out on DPS) which are measures that most other classes won't need to take. This only hurts us even more since our DPS is already lower compared to other magicka classes, thus making us even more irrelevant on the HM Trials scene.