Okay, so I haven't really thrown one of my crazy "I thought of this while showering/driving home from work" ideas out in a long time.
I've noticed people have been wanting harder bashing with more focus on bashing as a group with bigger rewards, and not just honours mobs that require you to get X dragons and all hit gut at the same time.
So I've never played WoW past level 30, but the crazy idea revolves around sort of 'instances' like they have. Basically only you and your party can enter the bashing area at the same time. You'd go somewhere that everyone can go - like Delos or something. And greet some magical creature that can conjure fake dungeons. That give you exp when you complete them.
After you're in, you're in sort of a 'ready up' room where you prepare to start. Then you just move forward in the rooms while hordes of monsters attack you. They would attack you smartly, though. They'd do lots of afflictions and the mobs would auto know what you had. So they'd chain together aeon/kalmia/web/etc. and focus on specific targets.
For difficulty, the monsters would scale with how many artefacts the group had, total levels, might, etc. So if a group of artied dragons went in, the monsters they would face would instant kill a level 80 group of people etc.
Experience wise, it would work out to be 2-3 times the experience you would have gotten bashing solo for the time you spent in the 'instance'. So if you get 10% per 30 minutes at the level you are, you'd get 20-30% in the same time in the instance (assuming you completed it successfully). Gold would be the same rate. After you finish, the illusion corpses or whatever could be converted to real essence you could raise shrines/defile with.
Here's another cool part. Each city/house/order would get to design an instance. The area, denizens in it, the general attacks, etc. (Okay obviously this would be subject to a lot of admin approval, but the idea is that the admins don't have to spend 5000 hours on this, some of it would be done by players so it's a bit easier. And cooler.)
Anyway, the real point is to just increase interaction between players while hunting - giving you incentive to group up and bash together, make strategies for completing instances, etc.