In all honesty, the reduction of event keys in guild tasks already seems to be a targeted outlet for sinking surplus glory rather than gems, since spending extra glory on the event keys is technically “cheaper” than spending gems in terms of opportunity costs, especially for VIP players and especially once arcanes are no longer scarce. The main problem is that most people will still need the glory packs, which are much more valuable overall because of the bundled items, and for everyone else the spoils are such a huge pain to buy in usable quantities when you might need dozens or even hundreds of keys, and you have to buy them 1 at a time. We really need multipacks.
Plunder of War: 10 event keys for 1500 glory. Bounty of War: 50 event keys for 7200 glory. Nothing else needed in the packs, just event keys.