It seems like a good idea, but I think they should make those unlockable by using your abilities, and not glimmer. I really think they should go a step above what prismatic established, and should remove all subclass and combine them all into one class. You can unlock the fragments and aspects from ikora, but you could infinitely build craft. Imagine being able to use your exotic class item for all Subclasses since it would all be in one class, and combine most of your favorite subclass specific builds together, and allowed to have 5 aspects, and 15 fragement slots, with all supers available for that specific class. If you are a hunter, maybe also be able to equip aspects from warlocks and titans? You would be able to dive to go invisible, suspend and freeze targets on Hunter with 3 aspects by using just your subclass. Maybe able to use gathering Storm with Weighted Knife, Void Spike, Knock em down, Vanishing step, Ensnaring Slam, Whirling Marlstrom and Lethal Current for example. This makes it to where the Subclasses can't be overshadowed by prismatic, since they would all be incorporated into one class.