I would be happy if they did the following:
1.) Remove the afterglow trial completely. Anyone finished or partially finished this "99+1" stage is reimbursed the Marrows they spent at a special in-game box they can access at any time (I.e. like the chest by the Abyssea NM's in Port Jeuno).
2.) Realize that R/M/E/C need more than just a WS 'unlock', they need a base damage boost. WS unlock is not a bad idea for an added perk, but our final (read:comparative to the new weapons revealed) R/M/E/C need a big boost to base damage. One that surpasses these other weapons.
3.) A new set of trials are opened for R/M/E/C. These should not be a 'grind' such as 1000 kill-shot WS on monster [type]. It could contain some SoA content, or maybe even older content such as "Kill Genbu 10 times" (for one stage). I don't mind a challenge, but it shouldn't be mindless work, keep in mind those of us who've obtained R/M/E/C have in many cases committed months of our lives to the task (Coin weapons perhaps being a bit of an exception, especially after the bazaar update to WoE coins). So a bit of Yin and Yang is needed to find a balance. If the trials are made interesting enough, they could be fun and bring meaning to both the reward and add more gameplay.
Anything short of that I would not be happy with, and will probably keep my account inactive (per my previous post in this thread).