I would like to see guildleves become more fleshed out in the future, at the very least for battle classes. It would be a great way to create more controlled encounters in the open worlds (mobs are locked to the group doing the leve).

Stuff like one-off leves that you have to find or buy.. Guildleve chains that unlock one after the other. A combination of the two. Raid bosses as guildleves...

There are so many possibilities to peruse the open world with this feature, while still having a controlled environment.