I was thinking it would be more exotic like using several frostbolts to stack the dmg buff until it reaches max stacks like with arcane blast and then using a secondary spell to unleash the dmg-buff and that there would be a rotation for the secondary spell (using longer cooldown more powerful spells if they are ready2use). This would make it more dynamic and add an actual rotation. If you end up casting only frostbolt and fireball then there wouldnt be much point in the change at all.