Simple suggestion; have all the various lodestones(e.g. Molten, Onyx, Charged etc.) be purchasable through the use of their respective dungeon tokens, such as TA tokens for Onyx Lodestones, CoE Tokens for Charged Lodestones and so on.
One of the benefits is that this will ensure there is an incentive for running dungeons even after acquiring the armor sets, it will also ease the grind, as Lodestones currently are , in my experience, extremely rare, often only Cores drop, of which 3 are needed to combine into a Lodestone.
Say 20 tokens for 1 Lodestone, allowing you to purchase 3 for a daily run, ensuring this target is achievable in a reasonable time frame for the average player, and easing some of the gold sinks, as currently it is nigh impossible to acquire 100 Lodestones for a Legendary without turning to the Trading Post.