I understand what ZOS are trying to do with this set and I also accept that the previous iteration was simply good for builds that focused on one damage type but currently there is 0 use for this set as it is now. Even if you get the buff, chances are it’s only buffing one or two skills. So I have a suggested rework that would promote people to use all three damage types when running the set.
Elemental Succession:
(2 items) Adds 1096 Maximum Magicka
(3 items) Adds 129 Weapon Damage and Spell Damage
(4 items) Adds 1096 Maximum Magicka
(5 items) Whenever you deal Flame, Shock, or Frost Damage, you gain a stack of Elemental Overload that grants you 150 Spell Damage for 6 seconds stacking up to 3 times. While at 3 stacks you also gain Major Prophecy, increasing your Critical Chance by 2629. Each damage type can only give one stack at a time and stacks do not refresh.
This way the set would be pretty terrible for a build that only uses one or two elemental damage types but excellent in builds that can keep all three damage types up, which would allow such rare players some viability.