I would like to see some quests that actually take some time to complete and would take a group to complete it to enter into another area.
For example, to enter an area (flashpoint, operation) you need to aquire a key, to get the key you need to quest for an item, combine it with something that got dropped off a hard boss etc. That way you feel you are working towards something with a group.
This shouldnt be a quest you can get in a day, it should be something that takes a while. That way you feel liek you are working towards something.