It'd be cool if it involved scripted battles and sieges. If you have the fort before you defend bruma, it'd be cool if shortly after, molag bal tries to set up a siege on your personal fort.
i also think it would be kool if they added a patch were you get to make your own guild. Recruit members set up a base and color scheme ect. Im not sure how it would fit but i think it would be pretty kool if you had diffrent choices to make while setting it up.