I would love to see raiding zones / instances that are accessible once a week or so. They must be designed for 20-24 players, best example would be what they have in EQ2. This was the best way to build comaredery and work together on taking down big bosses with end of game rewards that you can't get anywhere else. Also every tier would need to have a few different raiding zones so that everyone can enjoy raiding no matter what level you are. Final boss could be giving a title and end of game weapon that you could upgrade by defeating next tier end boss. Armor and weapons received from raiding bosses should only be attainable in raiding zones and they must be good looking and recognizable depending on a raiding zone or maybe tier. Full sets of armor with bonuses if you have completed or cleared the whole raiding zone. Raiding zones should be accessible only if you have enough people in your raid and they gotta be instance style so that you are not competing with other guilds on who is going to snatch a boss first.