I'd be happy with changing how they look.
Much more transparent for example, a base that is a bit lower then current with projectors facing upwards. I'd be happy with the war walls being replaces with the same barriers used for open zone instances - a thin blue force field that is only visible close up. Much less ugly and still in place for story and function.
I'd love to see all the in-between spaces fleshed out. Put in housing tracts, low level zones for now - add a lot of space for the RP crowd and more places for low to mid level instance doors. I just done see the manpower being there.
I was at a meet-n-greet in SF back in the live days and asked about removing the War Walls and all of the devs in earshot had their eyes bug out and a massive amount of defensiveness followed.
I wonder if someone could put together an AI based random zone generator?