Just throwing another old idea:
Guild Halls.
Instanced buildings within Org and SW that can be customized with banners, statues from achieves, etc.
Mission tables for all applicable expansions and the weekly Mythic Loot Chest could also be found there. Portals to every raid in the current expansion. A banker. An auctioneer. Everything and anything the guild needs in a centralized location where guildies can congregate.
Heck, you can even make the dang thing cost 50k gold and only be unlocked by an achievement just to prevent/discourage 1-account guilds from abusing this feature.
This, and restoring granular rank controls.
Until the wife is happy, I cannot let this thread slip.