Thank you for asking about Guild Decay!
I can't tell you how much it means that a dev actually cares or listens about this subject.
Please get rid of guild decay because it hurts the social dynamic of this game. If someone asks me for help in a quest when I log in during the week, it means that I will end up running slower and getting less renown as a result. Yet decay is still there every day regardless.
Guilds shouldn't be punished for slowing down their pace when running with casual or new players. To me this is just a common courtesy and not something that should cause guilds to move backward. I shouldn't have to solo to earn enough renown for the day.
The change October helped large guilds with a big reduction in decay. That is great, but small guilds that accept new/casual players and guilds started by new players will still stall at some point. Since most people have limited play time, that means the only way to combat it is by getting renown faster. This means soloing and not posting LFMs.
RPG players want to progress - it's in our bones. Taking away progress that is earned isn't necessary and isn't going to improve satisfaction with this game.
I also think Guild Elixir would sell better if people could actually keep what they earned. A level 55 guild that is stalled at level 55 due to decay would earn 2 levels in a whole year if decay is removed. I can show you the match to back that up. Let them earn their 2 levels please.