simply keeping the current system with only change in rewarding ones that actually completed the GQ would do just nicely and would be no need for such drastic changes and all the drama that follows... i think BB is able to do something like that ?
effects:
-relieved pressure on the guildies and most certainly on officers
-casual players can pop in, grab a few rewards a month and dash out till they feel comfy to continue (with the current side effect of raising the need limit, but that's on the guild's management to decide whether they keep them or not, as till now)
-happier and less "must do GQ asap" stressful environment for the whole game
-reasonable amount of coins within the game and per server (should be BB's path to keep guild coins their real value, and not expected grand fluctuations before and in in the first few months after the shop change)