I think synergy should become a part of the process of leveling synthesis professions. This way you have items that are easy to mass produce and good for skilling up the various professions as well as the synergy skill simultaneously.
Gear augmentation should be completely separate from this process as far as skill requirements, and past evolith gear should be converted so the new system can overwrite them.
I welcome new abjuration gear assuming the systems they're tied to are practical. And I'd like to see their stats comparable to other high level sets.
I really enjoyed the idea of being able to have different colored gear, though implementation of the evolith gear made them prettymuch useless right out of the gate. Would love to see the inclusion of color choice in gear as something the end buyer has control over, and not what the initial crafter happened to include. Color should be able to be changed at any time without losing the equipments current augments.
Assuming the new augment system is implemented, I'd like to see all new gear, crafted, looted, upgraded to be able to take advantage of the static system. This way you can obtain the gear you prefer, and still be able to customize it's stats to your own liking.